diff --git a/.env.example b/.env.example
index 18585538..e78d074a 100644
--- a/.env.example
+++ b/.env.example
@@ -167,6 +167,9 @@ TELESRV_STARGIFT_CRAFT_DELAY=0s
 TELESRV_STARGIFT_CRAFT_CHANCE_PERMILLE=250
 TELESRV_BLOB_DIR=data/blobs
 TELESRV_STICKER_SEED_DIR=data/sticker-seed
+# Optional Premium feature-preview media export. Missing directory keeps the
+# no-video fallback; an existing but incomplete/invalid directory fails startup.
+TELESRV_PREMIUM_PROMO_SEED_DIR=data/premium-promo
 
 # Optional public-link Web listener for /<username>, profile avatars,
 # sticker/custom emoji sets, and shared folders. This is a host:port bind
diff --git a/cmd/telesrv/main.go b/cmd/telesrv/main.go
index c1c8b82d..1c0d9beb 100644
--- a/cmd/telesrv/main.go
+++ b/cmd/telesrv/main.go
@@ -494,6 +494,15 @@ func run(logger *zap.Logger) error {
 			zap.Int("blobs", stats.Blobs),
 		)
 	}
+	if stats, err := filesService.SeedPremiumPromo(ctx, cfg.PremiumPromoSeedDir); err != nil {
+		return fmt.Errorf("seed premium promo: %w", err)
+	} else if !stats.Skipped {
+		logger.Info("Premium promo 视频种子导入完成",
+			zap.String("dir", cfg.PremiumPromoSeedDir),
+			zap.Int("videos", stats.Videos),
+			zap.Int("blobs", stats.Blobs),
+		)
+	}
 	if stats, err := filesService.SeedAppearance(ctx); err != nil {
 		return fmt.Errorf("seed appearance: %w", err)
 	} else if !stats.Skipped {
@@ -901,6 +910,7 @@ func run(logger *zap.Logger) error {
 		Channels:             channelsService,
 		Communities:          communitiesService,
 		Files:                filesService,
+		PremiumPromo:         filesService,
 		Bots:                 botsService,
 		Polls:                pollsapp.NewService(pollStore),
 		Stories:              storiesService,
diff --git a/docs/configuration.en.md b/docs/configuration.en.md
index a6dc2af0..b97a8da5 100644
--- a/docs/configuration.en.md
+++ b/docs/configuration.en.md
@@ -389,6 +389,7 @@ key rings independently on different instances.
 | `TELESRV_BLOB_DIR` | path / `data/blobs` | Local development blob-backend root for media bytes. |
 | `TELESRV_STICKER_SEED_DIR` | path / `data/sticker-seed` | Sticker/reaction seed packages imported into documents, sticker sets, and blobs. |
 | `TELESRV_STICKER_SEED_MAX_SETS` | int / `300` | Maximum regular sticker sets imported at startup; `<=0` means unlimited. |
+| `TELESRV_PREMIUM_PROMO_SEED_DIR` | path / `data/premium-promo` | Exported `help.getPremiumPromo` manifest, MP4 videos, and JPEG thumbnails. A missing directory keeps the no-video fallback; an existing invalid/incomplete directory fails startup. |
 
 The language-pack file manifest is authoritative. To add a language, place `data/langpack/<pack>/<pack>_<lang>_v<version>.strings` and restart `telesrv`. The `pack` must match its first-level directory and may use the letters, digits, `-`, and `_` already used by Telegram (for example, `android_x`); `lang` is canonicalized to lowercase with hyphens (`pt_BR` becomes `pt-br`). Only the highest file version for each language is loaded. Effective content changes require a version bump; same-version effective mutations and version rollbacks stop startup. Removing a language file or an entire pack subdirectory atomically removes its database catalog and strings on the next restart. Startup streams a source-file SHA-256 first: unchanged files reuse the last atomic manifest without parsing strings or writing the database, while only new or changed files are parsed and replaced through PostgreSQL `COPY`.
 
diff --git a/docs/configuration.zh-CN.md b/docs/configuration.zh-CN.md
index 34edc6ea..13005591 100644
--- a/docs/configuration.zh-CN.md
+++ b/docs/configuration.zh-CN.md
@@ -373,6 +373,7 @@ active key。不要手工编辑 manifest 或 PEM，不要在各实例上分别
 | `TELESRV_BLOB_DIR` | path / `data/blobs` | 本地开发 blob backend 的媒体字节根目录。 |
 | `TELESRV_STICKER_SEED_DIR` | path / `data/sticker-seed` | 导入 documents、sticker sets、blob 的贴纸/reaction seed 目录。 |
 | `TELESRV_STICKER_SEED_MAX_SETS` | int / `300` | 启动时导入的常规贴纸集上限；`<=0` 表示不限。 |
+| `TELESRV_PREMIUM_PROMO_SEED_DIR` | path / `data/premium-promo` | `help.getPremiumPromo` 导出的 manifest、MP4 视频与 JPEG 缩略图目录。目录缺失时保留无视频兼容响应；目录存在但内容非法或不完整时启动失败。 |
 
 语言包 seed 以文件 manifest 为事实源。新增语言时放入 `data/langpack/<pack>/<pack>_<lang>_v<version>.strings` 并重启 `telesrv`；`pack` 必须与所在一级目录一致，允许 Telegram 已使用的字母、数字、`-` 与 `_`（例如 `android_x`），`lang` 会统一为小写、连字符形式（例如 `pt_BR` 归一为 `pt-br`）。同一语言存在多个文件时只读取最高版本。修改已有语言的有效内容必须提高版本；同版本有效内容变化或版本倒退会阻止启动。删除语言文件或整个 pack 子目录后，下次重启会原子移除对应数据库目录和字符串。启动先流式计算源文件 SHA-256；未变化文件复用上次原子 manifest，不解析字符串也不写库，只有新增或变化文件才解析并通过 PostgreSQL `COPY` 整包替换。
 
diff --git a/internal/app/files/premium_promo_seed.go b/internal/app/files/premium_promo_seed.go
new file mode 100644
index 00000000..fb67705d
--- /dev/null
+++ b/internal/app/files/premium_promo_seed.go
@@ -0,0 +1,575 @@
+package files
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"hash"
+	"image/jpeg"
+	"io"
+	"os"
+	"path/filepath"
+	"reflect"
+	"sort"
+	"strings"
+	"time"
+
+	"telesrv/internal/domain"
+
+	"go.uber.org/zap"
+)
+
+const (
+	premiumPromoSeedStateKey     = "files.premium_promo"
+	premiumPromoSeedStateVersion = "premium-promo-v1"
+
+	premiumPromoManifestName = "premium_promo.json"
+	premiumPromoMaxVideos    = 128
+	premiumPromoMaxVideoSize = int64(64 << 20)
+	premiumPromoMaxThumbSize = int64(4 << 20)
+	premiumPromoMaxTotalSize = int64(512 << 20)
+)
+
+// PremiumPromoSeedStats reports the startup import outcome. Videos is the
+// number of usable catalog entries; Blobs counts main/thumbnail blobs written
+// during this run.
+type PremiumPromoSeedStats struct {
+	Videos  int
+	Blobs   int
+	Skipped bool
+}
+
+type premiumPromoSeedJSON struct {
+	APICall       string             `json:"api_call"`
+	StatusText    string             `json:"status_text"`
+	VideoSections []string           `json:"video_sections"`
+	Videos        []seedDocumentJSON `json:"videos"`
+	PeriodOptions []json.RawMessage  `json:"period_options"`
+}
+
+type premiumPromoSeedVideo struct {
+	section   string
+	document  domain.Document
+	mainPath  string
+	thumbPath string
+	thumbType string
+}
+
+// SeedPremiumPromo imports the exported promo videos into the ordinary
+// document/file_blob storage. A missing root is an optional-resource fallback;
+// once the directory exists, malformed or incomplete data is a startup error.
+func (s *Service) SeedPremiumPromo(ctx context.Context, root string) (PremiumPromoSeedStats, error) {
+	var stats PremiumPromoSeedStats
+	if root == "" {
+		s.clearPremiumPromo()
+		stats.Skipped = true
+		s.warnPremiumPromoMissing(root, errors.New("seed dir is empty"))
+		return stats, nil
+	}
+	info, err := os.Stat(root)
+	if err != nil {
+		if os.IsNotExist(err) {
+			s.clearPremiumPromo()
+			stats.Skipped = true
+			s.warnPremiumPromoMissing(root, err)
+			return stats, nil
+		}
+		return stats, fmt.Errorf("stat premium promo seed dir %q: %w", root, err)
+	}
+	if !info.IsDir() {
+		return stats, fmt.Errorf("premium promo seed path %q is not a directory", root)
+	}
+
+	manifestPath := filepath.Join(root, premiumPromoManifestName)
+	raw, err := os.ReadFile(manifestPath)
+	if err != nil {
+		return stats, fmt.Errorf("read premium promo manifest %q: %w", manifestPath, err)
+	}
+	videos, err := parsePremiumPromoSeed(root, raw)
+	if err != nil {
+		return stats, fmt.Errorf("validate premium promo seed: %w", err)
+	}
+	for i := range videos {
+		videos[i].document.DCID = s.dc
+	}
+	stats.Videos = len(videos)
+
+	stateHash, err := premiumPromoSeedHash(raw, videos, s.dc)
+	if err != nil {
+		return stats, fmt.Errorf("hash premium promo seed: %w", err)
+	}
+	stateMatches, err := s.seedStateMatches(ctx, premiumPromoSeedStateKey, stateHash)
+	if err != nil {
+		return stats, fmt.Errorf("read premium promo seed state: %w", err)
+	}
+	if stateMatches {
+		if catalog, ready, err := s.loadPremiumPromoCatalog(ctx, videos); err != nil {
+			return stats, fmt.Errorf("verify premium promo catalog: %w", err)
+		} else if ready {
+			s.setPremiumPromoCatalog(catalog)
+			stats.Skipped = true
+			return stats, nil
+		}
+	}
+
+	for _, video := range videos {
+		existing, found, err := s.media.GetDocument(ctx, video.document.ID)
+		if err != nil {
+			return stats, fmt.Errorf("read premium promo document %d: %w", video.document.ID, err)
+		}
+		if found && existing.AccessHash != video.document.AccessHash {
+			return stats, fmt.Errorf(
+				"premium promo document %d collides with access_hash %d (seed has %d)",
+				video.document.ID,
+				existing.AccessHash,
+				video.document.AccessHash,
+			)
+		}
+
+		forceBlobWrite := !stateMatches
+		if wrote, err := s.putPremiumPromoBlob(
+			ctx,
+			fmt.Sprintf("doc:%d", video.document.ID),
+			video.mainPath,
+			video.document.MimeType,
+			video.document.Size,
+			forceBlobWrite,
+		); err != nil {
+			return stats, fmt.Errorf("import premium promo video %d: %w", video.document.ID, err)
+		} else if wrote {
+			stats.Blobs++
+		}
+		thumb := video.document.Thumbs[0]
+		if wrote, err := s.putPremiumPromoBlob(
+			ctx,
+			fmt.Sprintf("doc:%d:%s", video.document.ID, video.thumbType),
+			video.thumbPath,
+			"image/jpeg",
+			int64(thumb.Size),
+			forceBlobWrite,
+		); err != nil {
+			return stats, fmt.Errorf("import premium promo thumbnail %d: %w", video.document.ID, err)
+		} else if wrote {
+			stats.Blobs++
+		}
+		if err := s.media.PutDocument(ctx, video.document); err != nil {
+			return stats, fmt.Errorf("store premium promo document %d: %w", video.document.ID, err)
+		}
+	}
+
+	catalog, ready, err := s.loadPremiumPromoCatalog(ctx, videos)
+	if err != nil {
+		return stats, fmt.Errorf("verify imported premium promo catalog: %w", err)
+	}
+	if !ready {
+		return stats, errors.New("premium promo catalog is incomplete after import")
+	}
+	if err := s.putSeedState(ctx, premiumPromoSeedStateKey, stateHash); err != nil {
+		return stats, fmt.Errorf("record premium promo seed state: %w", err)
+	}
+	s.setPremiumPromoCatalog(catalog)
+	return stats, nil
+}
+
+// PremiumPromo returns a deep copy so callers cannot mutate the startup
+// catalog or another request's response.
+func (s *Service) PremiumPromo(_ context.Context) (domain.PremiumPromoCatalog, bool, error) {
+	s.premiumPromoMu.RLock()
+	defer s.premiumPromoMu.RUnlock()
+	if !s.premiumPromoReady {
+		return domain.PremiumPromoCatalog{}, false, nil
+	}
+	return domain.PremiumPromoCatalog{
+		VideoSections: append([]string(nil), s.premiumPromo.VideoSections...),
+		Videos:        copyDocuments(s.premiumPromo.Videos),
+	}, true, nil
+}
+
+func (s *Service) setPremiumPromoCatalog(catalog domain.PremiumPromoCatalog) {
+	s.premiumPromoMu.Lock()
+	defer s.premiumPromoMu.Unlock()
+	s.premiumPromo = domain.PremiumPromoCatalog{
+		VideoSections: append([]string(nil), catalog.VideoSections...),
+		Videos:        copyDocuments(catalog.Videos),
+	}
+	s.premiumPromoReady = true
+}
+
+func (s *Service) clearPremiumPromo() {
+	s.premiumPromoMu.Lock()
+	defer s.premiumPromoMu.Unlock()
+	s.premiumPromo = domain.PremiumPromoCatalog{}
+	s.premiumPromoReady = false
+}
+
+func (s *Service) warnPremiumPromoMissing(root string, err error) {
+	if s.log == nil {
+		return
+	}
+	s.log.Warn(
+		"Premium promo seed 目录不存在，help.getPremiumPromo 将返回无视频兼容响应",
+		zap.String("dir", root),
+		zap.Error(err),
+	)
+}
+
+func parsePremiumPromoSeed(root string, raw []byte) ([]premiumPromoSeedVideo, error) {
+	var parsed premiumPromoSeedJSON
+	if err := json.Unmarshal(raw, &parsed); err != nil {
+		return nil, fmt.Errorf("parse %s: %w", premiumPromoManifestName, err)
+	}
+	if parsed.APICall != "help.getPremiumPromo" {
+		return nil, fmt.Errorf("api_call = %q, want help.getPremiumPromo", parsed.APICall)
+	}
+	if len(parsed.VideoSections) == 0 || len(parsed.VideoSections) > premiumPromoMaxVideos {
+		return nil, fmt.Errorf("video_sections count %d is outside 1..%d", len(parsed.VideoSections), premiumPromoMaxVideos)
+	}
+	if len(parsed.VideoSections) != len(parsed.Videos) {
+		return nil, fmt.Errorf("video_sections count %d does not match videos count %d", len(parsed.VideoSections), len(parsed.Videos))
+	}
+
+	seenSections := make(map[string]struct{}, len(parsed.VideoSections))
+	seenDocuments := make(map[int64]struct{}, len(parsed.Videos))
+	out := make([]premiumPromoSeedVideo, 0, len(parsed.Videos))
+	var totalSize int64
+	for i, dj := range parsed.Videos {
+		section := parsed.VideoSections[i]
+		if !validPremiumPromoSection(section) {
+			return nil, fmt.Errorf("video_sections[%d] %q is invalid", i, section)
+		}
+		if _, exists := seenSections[section]; exists {
+			return nil, fmt.Errorf("duplicate video section %q", section)
+		}
+		seenSections[section] = struct{}{}
+
+		if dj.ID <= 0 {
+			return nil, fmt.Errorf("videos[%d].id must be positive", i)
+		}
+		if _, exists := seenDocuments[dj.ID]; exists {
+			return nil, fmt.Errorf("duplicate video document id %d", dj.ID)
+		}
+		seenDocuments[dj.ID] = struct{}{}
+		if dj.AccessHash == 0 {
+			return nil, fmt.Errorf("videos[%d].access_hash must be non-zero", i)
+		}
+		fileReference, err := hex.DecodeString(dj.FileReference)
+		if err != nil || len(fileReference) == 0 {
+			return nil, fmt.Errorf("videos[%d].file_reference is not non-empty hex", i)
+		}
+		date, err := time.Parse(time.RFC3339, dj.Date)
+		if err != nil || date.Unix() < 0 || date.Unix() > 1<<31-1 {
+			return nil, fmt.Errorf("videos[%d].date %q is outside TL int date range", i, dj.Date)
+		}
+		if dj.MimeType != "video/mp4" {
+			return nil, fmt.Errorf("videos[%d].mime_type = %q, want video/mp4", i, dj.MimeType)
+		}
+		if dj.Size <= 0 || dj.Size > premiumPromoMaxVideoSize {
+			return nil, fmt.Errorf("videos[%d].size %d is outside 1..%d", i, dj.Size, premiumPromoMaxVideoSize)
+		}
+		if err := validatePremiumPromoAttributes(i, dj.Attributes); err != nil {
+			return nil, err
+		}
+
+		mainPath := filepath.Join(root, "documents", fmt.Sprintf("%d.mp4", dj.ID))
+		mainInfo, err := regularFileInfo(mainPath)
+		if err != nil {
+			return nil, fmt.Errorf("videos[%d] main file: %w", i, err)
+		}
+		if mainInfo.Size() != dj.Size {
+			return nil, fmt.Errorf("videos[%d] main file size %d does not match manifest %d", i, mainInfo.Size(), dj.Size)
+		}
+		if err := validateMP4Header(mainPath); err != nil {
+			return nil, fmt.Errorf("videos[%d] main file: %w", i, err)
+		}
+
+		thumbPath := filepath.Join(root, "thumbs", fmt.Sprintf("%d.jpg", dj.ID))
+		thumbInfo, err := regularFileInfo(thumbPath)
+		if err != nil {
+			return nil, fmt.Errorf("videos[%d] thumbnail: %w", i, err)
+		}
+		if thumbInfo.Size() <= 0 || thumbInfo.Size() > premiumPromoMaxThumbSize {
+			return nil, fmt.Errorf("videos[%d] thumbnail size %d is outside 1..%d", i, thumbInfo.Size(), premiumPromoMaxThumbSize)
+		}
+		w, h, err := jpegDimensions(thumbPath)
+		if err != nil {
+			return nil, fmt.Errorf("videos[%d] thumbnail: %w", i, err)
+		}
+		thumbType := premiumPromoThumbType(w, h)
+		attributes := seedDocumentAttributes(dj.Attributes)
+		document := domain.Document{
+			ID:            dj.ID,
+			AccessHash:    dj.AccessHash,
+			FileReference: fileReference,
+			Date:          int(date.Unix()),
+			MimeType:      dj.MimeType,
+			Size:          dj.Size,
+			DCID:          0, // overwritten with the canonical server DC by the caller
+			Attributes:    attributes,
+			Thumbs: []domain.PhotoSize{{
+				Kind: domain.PhotoSizeKindDefault,
+				Type: thumbType,
+				W:    w,
+				H:    h,
+				Size: int(thumbInfo.Size()),
+			}},
+		}
+		out = append(out, premiumPromoSeedVideo{
+			section:   section,
+			document:  document,
+			mainPath:  mainPath,
+			thumbPath: thumbPath,
+			thumbType: thumbType,
+		})
+		totalSize += mainInfo.Size() + thumbInfo.Size()
+		if totalSize > premiumPromoMaxTotalSize {
+			return nil, fmt.Errorf("premium promo source bytes %d exceed limit %d", totalSize, premiumPromoMaxTotalSize)
+		}
+	}
+	return out, nil
+}
+
+func validatePremiumPromoAttributes(index int, attrs []seedAttrJSON) error {
+	var filename, video, animated int
+	for j, attr := range attrs {
+		switch attr.Type {
+		case "DocumentAttributeFilename":
+			filename++
+			if strings.TrimSpace(attr.FileName) == "" {
+				return fmt.Errorf("videos[%d].attributes[%d] has empty file_name", index, j)
+			}
+		case "DocumentAttributeVideo":
+			video++
+			if attr.W <= 0 || attr.W > 16384 || attr.H <= 0 || attr.H > 16384 {
+				return fmt.Errorf("videos[%d].attributes[%d] has invalid video dimensions %dx%d", index, j, attr.W, attr.H)
+			}
+			if attr.Duration <= 0 || attr.Duration > 3600 {
+				return fmt.Errorf("videos[%d].attributes[%d] has invalid duration %v", index, j, attr.Duration)
+			}
+		case "DocumentAttributeAnimated":
+			animated++
+		default:
+			return fmt.Errorf("videos[%d].attributes[%d] has unsupported type %q", index, j, attr.Type)
+		}
+	}
+	if filename != 1 || video != 1 || animated > 1 {
+		return fmt.Errorf("videos[%d] must contain exactly one filename/video and at most one animated attribute", index)
+	}
+	return nil
+}
+
+func validPremiumPromoSection(section string) bool {
+	if section == "" || len(section) > 64 {
+		return false
+	}
+	for _, r := range section {
+		if (r < 'a' || r > 'z') && (r < '0' || r > '9') && r != '_' {
+			return false
+		}
+	}
+	return true
+}
+
+func regularFileInfo(path string) (os.FileInfo, error) {
+	info, err := os.Stat(path)
+	if err != nil {
+		return nil, err
+	}
+	if !info.Mode().IsRegular() {
+		return nil, fmt.Errorf("%q is not a regular file", path)
+	}
+	return info, nil
+}
+
+func validateMP4Header(path string) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	header := make([]byte, 12)
+	if _, err := io.ReadFull(f, header); err != nil {
+		return fmt.Errorf("read MP4 header: %w", err)
+	}
+	if string(header[4:8]) != "ftyp" {
+		return errors.New("missing ISO BMFF ftyp header")
+	}
+	return nil
+}
+
+func jpegDimensions(path string) (int, int, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return 0, 0, err
+	}
+	defer f.Close()
+	cfg, err := jpeg.DecodeConfig(f)
+	if err != nil {
+		return 0, 0, fmt.Errorf("decode JPEG config: %w", err)
+	}
+	if cfg.Width <= 0 || cfg.Width > 16384 || cfg.Height <= 0 || cfg.Height > 16384 {
+		return 0, 0, fmt.Errorf("invalid JPEG dimensions %dx%d", cfg.Width, cfg.Height)
+	}
+	return cfg.Width, cfg.Height, nil
+}
+
+func premiumPromoThumbType(w, h int) string {
+	maxDimension := w
+	if h > maxDimension {
+		maxDimension = h
+	}
+	switch {
+	case maxDimension <= 100:
+		return "s"
+	case maxDimension <= 320:
+		return "m"
+	case maxDimension <= 800:
+		return "x"
+	case maxDimension <= 1280:
+		return "y"
+	default:
+		return "w"
+	}
+}
+
+func premiumPromoSeedHash(raw []byte, videos []premiumPromoSeedVideo, dc int) (string, error) {
+	return seedStateHash(func(h hash.Hash) error {
+		writeSeedStateHeader(h, premiumPromoSeedStateVersion, dc)
+		if _, err := h.Write(raw); err != nil {
+			return err
+		}
+		paths := make([]string, 0, len(videos)*2)
+		for _, video := range videos {
+			paths = append(paths, video.mainPath, video.thumbPath)
+		}
+		sort.Strings(paths)
+		for _, path := range paths {
+			info, err := regularFileInfo(path)
+			if err != nil {
+				return err
+			}
+			rel := filepath.Join(filepath.Base(filepath.Dir(path)), filepath.Base(path))
+			_, _ = fmt.Fprintf(h, "\nfile=%s\x00size=%d\x00mtime=%d", filepath.ToSlash(rel), info.Size(), info.ModTime().UnixNano())
+		}
+		return nil
+	})
+}
+
+func (s *Service) loadPremiumPromoCatalog(ctx context.Context, videos []premiumPromoSeedVideo) (domain.PremiumPromoCatalog, bool, error) {
+	ids := make([]int64, 0, len(videos))
+	locationKeys := make([]string, 0, len(videos)*2)
+	for i := range videos {
+		videos[i].document.DCID = s.dc
+		ids = append(ids, videos[i].document.ID)
+		locationKeys = append(
+			locationKeys,
+			fmt.Sprintf("doc:%d", videos[i].document.ID),
+			fmt.Sprintf("doc:%d:%s", videos[i].document.ID, videos[i].thumbType),
+		)
+	}
+	stored, err := s.media.GetDocuments(ctx, ids)
+	if err != nil {
+		return domain.PremiumPromoCatalog{}, false, err
+	}
+	if len(stored) != len(videos) {
+		return domain.PremiumPromoCatalog{}, false, nil
+	}
+	byID := make(map[int64]domain.Document, len(stored))
+	for _, doc := range stored {
+		byID[doc.ID] = doc
+	}
+	blobs, err := s.media.GetFileBlobs(ctx, locationKeys)
+	if err != nil {
+		return domain.PremiumPromoCatalog{}, false, err
+	}
+
+	catalog := domain.PremiumPromoCatalog{
+		VideoSections: make([]string, 0, len(videos)),
+		Videos:        make([]domain.Document, 0, len(videos)),
+	}
+	for _, video := range videos {
+		storedDoc, ok := byID[video.document.ID]
+		if !ok || !premiumPromoDocumentEqual(storedDoc, video.document) {
+			return domain.PremiumPromoCatalog{}, false, nil
+		}
+		mainKey := fmt.Sprintf("doc:%d", video.document.ID)
+		thumbKey := fmt.Sprintf("doc:%d:%s", video.document.ID, video.thumbType)
+		if !s.premiumPromoBlobReady(ctx, blobs[mainKey], mainKey, video.document.Size, video.document.MimeType) {
+			return domain.PremiumPromoCatalog{}, false, nil
+		}
+		if !s.premiumPromoBlobReady(ctx, blobs[thumbKey], thumbKey, int64(video.document.Thumbs[0].Size), "image/jpeg") {
+			return domain.PremiumPromoCatalog{}, false, nil
+		}
+		catalog.VideoSections = append(catalog.VideoSections, video.section)
+		catalog.Videos = append(catalog.Videos, storedDoc)
+	}
+	return catalog, true, nil
+}
+
+func premiumPromoDocumentEqual(got, want domain.Document) bool {
+	return got.ID == want.ID &&
+		got.AccessHash == want.AccessHash &&
+		bytes.Equal(got.FileReference, want.FileReference) &&
+		got.Date == want.Date &&
+		got.MimeType == want.MimeType &&
+		got.Size == want.Size &&
+		got.DCID == want.DCID &&
+		reflect.DeepEqual(got.Attributes, want.Attributes) &&
+		reflect.DeepEqual(got.Thumbs, want.Thumbs)
+}
+
+func (s *Service) premiumPromoBlobReady(ctx context.Context, blob domain.FileBlob, locationKey string, size int64, mimeType string) bool {
+	if blob.LocationKey != locationKey ||
+		blob.Backend != domain.MediaBackend(s.blobs.Name()) ||
+		blob.ObjectKey == "" ||
+		blob.Size != size ||
+		blob.MimeType != mimeType {
+		return false
+	}
+	_, total, err := s.blobs.GetRange(ctx, blob.ObjectKey, 0, 1)
+	return err == nil && total == size
+}
+
+func (s *Service) putPremiumPromoBlob(
+	ctx context.Context,
+	locationKey string,
+	path string,
+	mimeType string,
+	wantSize int64,
+	force bool,
+) (bool, error) {
+	if !force {
+		if blob, found, err := s.media.GetFileBlob(ctx, locationKey); err != nil {
+			return false, err
+		} else if found && s.premiumPromoBlobReady(ctx, blob, locationKey, wantSize, mimeType) {
+			return false, nil
+		}
+	}
+	f, err := os.Open(path)
+	if err != nil {
+		return false, err
+	}
+	defer f.Close()
+	objectKey, size, sum, err := s.blobs.PutReader(ctx, f)
+	if err != nil {
+		return false, err
+	}
+	if size != wantSize {
+		return false, fmt.Errorf("streamed size %d does not match validated size %d", size, wantSize)
+	}
+	blob := domain.FileBlob{
+		LocationKey: locationKey,
+		Backend:     domain.MediaBackend(s.blobs.Name()),
+		ObjectKey:   objectKey,
+		Size:        size,
+		SHA256:      append([]byte(nil), sum...),
+		MimeType:    mimeType,
+	}
+	if err := s.media.PutFileBlob(ctx, blob); err != nil {
+		return false, err
+	}
+	s.blobCache.put(locationKey, blob)
+	return true, nil
+}
diff --git a/internal/app/files/premium_promo_seed_test.go b/internal/app/files/premium_promo_seed_test.go
new file mode 100644
index 00000000..8a60d6da
--- /dev/null
+++ b/internal/app/files/premium_promo_seed_test.go
@@ -0,0 +1,292 @@
+package files
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"image"
+	"image/color"
+	"image/jpeg"
+	"os"
+	"path/filepath"
+	"sync"
+	"testing"
+
+	"telesrv/internal/domain"
+)
+
+func TestSeedPremiumPromoImportsDownloadsSkipsAndRepairs(t *testing.T) {
+	ctx := context.Background()
+	root, videoBytes, thumbBytes := writePremiumPromoFixture(t)
+	media := newFakeMediaStore()
+	blobs, err := NewLocalFS(t.TempDir())
+	if err != nil {
+		t.Fatalf("NewLocalFS: %v", err)
+	}
+	svc := NewService(media, blobs, 7, WithVideoThumbnailer(nil), WithGIFTranscoder(nil))
+
+	first, err := svc.SeedPremiumPromo(ctx, root)
+	if err != nil {
+		t.Fatalf("SeedPremiumPromo first: %v", err)
+	}
+	if first.Skipped || first.Videos != 1 || first.Blobs != 2 {
+		t.Fatalf("first stats = %+v, want one video and two blobs", first)
+	}
+	catalog, found, err := svc.PremiumPromo(ctx)
+	if err != nil || !found {
+		t.Fatalf("PremiumPromo found=%v err=%v", found, err)
+	}
+	if len(catalog.VideoSections) != 1 || catalog.VideoSections[0] != "no_ads" || len(catalog.Videos) != 1 {
+		t.Fatalf("catalog = %+v", catalog)
+	}
+	doc := catalog.Videos[0]
+	if doc.DCID != 7 || doc.MimeType != "video/mp4" || len(doc.Thumbs) != 1 || doc.Thumbs[0].Type != "m" {
+		t.Fatalf("document = %+v", doc)
+	}
+
+	main, ok, err := svc.GetFile(ctx, domain.FileDownloadRequest{
+		LocationKey: fmt.Sprintf("doc:%d", doc.ID),
+		Limit:       len(videoBytes) + 1,
+	})
+	if err != nil || !ok {
+		t.Fatalf("download main ok=%v err=%v", ok, err)
+	}
+	if !bytes.Equal(main.Bytes, videoBytes) {
+		t.Fatalf("downloaded main = %x, want %x", main.Bytes, videoBytes)
+	}
+	thumb, ok, err := svc.GetFile(ctx, domain.FileDownloadRequest{
+		LocationKey: fmt.Sprintf("doc:%d:%s", doc.ID, doc.Thumbs[0].Type),
+		Limit:       len(thumbBytes) + 1,
+	})
+	if err != nil || !ok {
+		t.Fatalf("download thumb ok=%v err=%v", ok, err)
+	}
+	if !bytes.Equal(thumb.Bytes, thumbBytes) {
+		t.Fatalf("downloaded thumb differs: got %d bytes, want %d", len(thumb.Bytes), len(thumbBytes))
+	}
+
+	// Returned values are request-owned: mutating one response must not corrupt
+	// the immutable catalog seen by later/concurrent requests.
+	catalog.VideoSections[0] = "mutated"
+	catalog.Videos[0].FileReference[0] ^= 0xff
+	catalog.Videos[0].Thumbs[0].Type = "z"
+	again, found, err := svc.PremiumPromo(ctx)
+	if err != nil || !found {
+		t.Fatalf("PremiumPromo again found=%v err=%v", found, err)
+	}
+	if again.VideoSections[0] != "no_ads" || again.Videos[0].Thumbs[0].Type != "m" || again.Videos[0].FileReference[0] != 0 {
+		t.Fatalf("catalog was mutated through returned value: %+v", again)
+	}
+
+	var readers sync.WaitGroup
+	readerErrors := make(chan error, 32)
+	for i := 0; i < 32; i++ {
+		readers.Add(1)
+		go func() {
+			defer readers.Done()
+			got, found, err := svc.PremiumPromo(ctx)
+			if err != nil || !found || len(got.Videos) != 1 {
+				readerErrors <- fmt.Errorf("found=%v videos=%d err=%v", found, len(got.Videos), err)
+				return
+			}
+			got.VideoSections[0] = "request-owned"
+			got.Videos[0].FileReference[0] = 0x7f
+		}()
+	}
+	readers.Wait()
+	close(readerErrors)
+	for err := range readerErrors {
+		t.Error(err)
+	}
+
+	second, err := svc.SeedPremiumPromo(ctx, root)
+	if err != nil {
+		t.Fatalf("SeedPremiumPromo unchanged: %v", err)
+	}
+	if !second.Skipped || second.Videos != 1 || second.Blobs != 0 {
+		t.Fatalf("unchanged stats = %+v, want skipped catalog", second)
+	}
+
+	mainKey := fmt.Sprintf("doc:%d", doc.ID)
+	media.mu.Lock()
+	delete(media.blobs, mainKey)
+	media.mu.Unlock()
+	repaired, err := svc.SeedPremiumPromo(ctx, root)
+	if err != nil {
+		t.Fatalf("SeedPremiumPromo repair: %v", err)
+	}
+	if repaired.Skipped || repaired.Videos != 1 || repaired.Blobs != 1 {
+		t.Fatalf("repair stats = %+v, want one repaired blob", repaired)
+	}
+	if _, ok, err := media.GetFileBlob(ctx, mainKey); err != nil || !ok {
+		t.Fatalf("repaired main blob ok=%v err=%v", ok, err)
+	}
+}
+
+func TestSeedPremiumPromoMissingAndInvalidSources(t *testing.T) {
+	ctx := context.Background()
+	newService := func(t *testing.T) *Service {
+		t.Helper()
+		blobs, err := NewLocalFS(t.TempDir())
+		if err != nil {
+			t.Fatalf("NewLocalFS: %v", err)
+		}
+		return NewService(newFakeMediaStore(), blobs, 2, WithVideoThumbnailer(nil), WithGIFTranscoder(nil))
+	}
+
+	t.Run("missing directory falls back", func(t *testing.T) {
+		svc := newService(t)
+		stats, err := svc.SeedPremiumPromo(ctx, filepath.Join(t.TempDir(), "missing"))
+		if err != nil || !stats.Skipped {
+			t.Fatalf("stats=%+v err=%v, want optional-resource fallback", stats, err)
+		}
+		if _, found, err := svc.PremiumPromo(ctx); err != nil || found {
+			t.Fatalf("PremiumPromo found=%v err=%v, want unavailable", found, err)
+		}
+	})
+
+	t.Run("existing directory without manifest fails", func(t *testing.T) {
+		svc := newService(t)
+		if _, err := svc.SeedPremiumPromo(ctx, t.TempDir()); err == nil {
+			t.Fatal("existing incomplete seed directory was accepted")
+		}
+	})
+
+	t.Run("positional vectors must match", func(t *testing.T) {
+		root, _, _ := writePremiumPromoFixture(t)
+		rewritePremiumPromoManifest(t, root, func(m map[string]any) {
+			m["video_sections"] = []string{"no_ads", "extra"}
+		})
+		if _, err := newService(t).SeedPremiumPromo(ctx, root); err == nil {
+			t.Fatal("mismatched video_sections/videos was accepted")
+		}
+	})
+
+	t.Run("manifest size must match file", func(t *testing.T) {
+		root, _, _ := writePremiumPromoFixture(t)
+		rewritePremiumPromoManifest(t, root, func(m map[string]any) {
+			videos := m["videos"].([]any)
+			videos[0].(map[string]any)["size"] = float64(999)
+		})
+		if _, err := newService(t).SeedPremiumPromo(ctx, root); err == nil {
+			t.Fatal("wrong video size was accepted")
+		}
+	})
+
+	t.Run("missing thumbnail fails", func(t *testing.T) {
+		root, _, _ := writePremiumPromoFixture(t)
+		thumbPath := filepath.Join(root, "thumbs", "1000000000000001.jpg")
+		if err := os.Remove(thumbPath); err != nil {
+			t.Fatal(err)
+		}
+		if _, err := newService(t).SeedPremiumPromo(ctx, root); err == nil {
+			t.Fatal("missing thumbnail was accepted")
+		}
+	})
+}
+
+func TestSeedPremiumPromoFromRealExport(t *testing.T) {
+	root := os.Getenv("TELESRV_REAL_PREMIUM_PROMO_SEED_DIR")
+	if root == "" {
+		t.Skip("TELESRV_REAL_PREMIUM_PROMO_SEED_DIR not set")
+	}
+	if _, err := os.Stat(root); err != nil {
+		t.Skipf("seed dir %s not present: %v", root, err)
+	}
+	blobs, err := NewLocalFS(t.TempDir())
+	if err != nil {
+		t.Fatalf("NewLocalFS: %v", err)
+	}
+	svc := NewService(newFakeMediaStore(), blobs, 2, WithVideoThumbnailer(nil), WithGIFTranscoder(nil))
+	stats, err := svc.SeedPremiumPromo(context.Background(), root)
+	if err != nil {
+		t.Fatalf("SeedPremiumPromo: %v", err)
+	}
+	catalog, found, err := svc.PremiumPromo(context.Background())
+	if err != nil || !found {
+		t.Fatalf("PremiumPromo found=%v err=%v", found, err)
+	}
+	if stats.Videos != 31 || len(catalog.VideoSections) != 31 || len(catalog.Videos) != 31 {
+		t.Fatalf("stats=%+v sections=%d videos=%d, want 31", stats, len(catalog.VideoSections), len(catalog.Videos))
+	}
+	t.Logf("real premium promo seed: videos=%d blobs=%d", stats.Videos, stats.Blobs)
+}
+
+func writePremiumPromoFixture(t *testing.T) (string, []byte, []byte) {
+	t.Helper()
+	root := t.TempDir()
+	if err := os.MkdirAll(filepath.Join(root, "documents"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.MkdirAll(filepath.Join(root, "thumbs"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	const documentID int64 = 1000000000000001
+	videoBytes := []byte{0, 0, 0, 24, 'f', 't', 'y', 'p', 'i', 's', 'o', 'm', 0, 0, 0, 0}
+	if err := os.WriteFile(filepath.Join(root, "documents", fmt.Sprintf("%d.mp4", documentID)), videoBytes, 0o644); err != nil {
+		t.Fatal(err)
+	}
+	img := image.NewRGBA(image.Rect(0, 0, 160, 240))
+	for y := 0; y < 240; y++ {
+		for x := 0; x < 160; x++ {
+			img.Set(x, y, color.RGBA{R: uint8(x), G: uint8(y), B: 0x88, A: 0xff})
+		}
+	}
+	var thumb bytes.Buffer
+	if err := jpeg.Encode(&thumb, img, &jpeg.Options{Quality: 80}); err != nil {
+		t.Fatal(err)
+	}
+	thumbBytes := thumb.Bytes()
+	if err := os.WriteFile(filepath.Join(root, "thumbs", fmt.Sprintf("%d.jpg", documentID)), thumbBytes, 0o644); err != nil {
+		t.Fatal(err)
+	}
+	manifest := premiumPromoSeedJSON{
+		APICall:       "help.getPremiumPromo",
+		StatusText:    "ignored source status",
+		VideoSections: []string{"no_ads"},
+		Videos: []seedDocumentJSON{{
+			ID:            documentID,
+			AccessHash:    -7,
+			FileReference: "00112233445566778899aabbccddeeff",
+			Date:          "2026-01-02T03:04:05Z",
+			MimeType:      "video/mp4",
+			Size:          int64(len(videoBytes)),
+			DCID:          4,
+			Attributes: []seedAttrJSON{
+				{Type: "DocumentAttributeFilename", FileName: "promo.mp4"},
+				{Type: "DocumentAttributeVideo", W: 720, H: 1070, Duration: 5, SupportsStreaming: true},
+				{Type: "DocumentAttributeAnimated"},
+			},
+		}},
+	}
+	raw, err := json.MarshalIndent(manifest, "", "  ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(root, premiumPromoManifestName), raw, 0o644); err != nil {
+		t.Fatal(err)
+	}
+	return root, append([]byte(nil), videoBytes...), append([]byte(nil), thumbBytes...)
+}
+
+func rewritePremiumPromoManifest(t *testing.T, root string, mutate func(map[string]any)) {
+	t.Helper()
+	path := filepath.Join(root, premiumPromoManifestName)
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var manifest map[string]any
+	if err := json.Unmarshal(raw, &manifest); err != nil {
+		t.Fatal(err)
+	}
+	mutate(manifest)
+	raw, err = json.MarshalIndent(manifest, "", "  ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(path, raw, 0o644); err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/internal/app/files/service.go b/internal/app/files/service.go
index 789d86fd..3133b8a1 100644
--- a/internal/app/files/service.go
+++ b/internal/app/files/service.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"hash"
 	"io"
+	"sync"
 	"time"
 
 	"telesrv/internal/domain"
@@ -71,6 +72,13 @@ type Service struct {
 	// effectsHash 在 seed 时算一次,handler 直接比对返回 NotModified,无需每次 RPC 重算。
 	effects     []domain.AvailableEffect
 	effectsHash int
+
+	// premiumPromo is populated during startup seed and then read by RPC
+	// handlers. Keep a lock so the ownership boundary remains race-safe even
+	// when exercised concurrently in tests.
+	premiumPromoMu    sync.RWMutex
+	premiumPromo      domain.PremiumPromoCatalog
+	premiumPromoReady bool
 }
 
 // Option 配置 files 服务的可选能力。
diff --git a/internal/config/config.go b/internal/config/config.go
index 0035f3c4..5b62b9d7 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -211,6 +211,9 @@ type Config struct {
 	StickerSeedDir string
 	// StickerSeedMaxSets 限制导入的常规贴纸集数量（避免启动时导入过多包），<=0 表示不限。
 	StickerSeedMaxSets int
+	// PremiumPromoSeedDir 是 help.getPremiumPromo 视频与缩略图导出目录。
+	// 目录缺失时保留无视频兼容响应；目录存在但内容非法时启动失败。
+	PremiumPromoSeedDir string
 	// BusinessAIProvider 控制服务端 Business automation 回复生成器。
 	// 空值/"echo" 回显触发私聊文本，用于跑通后续 AI provider 链路；
 	// "template" 使用 quick reply 模板。
@@ -566,6 +569,7 @@ func Load() (Config, error) {
 		BlobDir:                       envOr("TELESRV_BLOB_DIR", "data/blobs"),
 		StickerSeedDir:                envOr("TELESRV_STICKER_SEED_DIR", "data/sticker-seed"),
 		StickerSeedMaxSets:            envIntOr("TELESRV_STICKER_SEED_MAX_SETS", 300),
+		PremiumPromoSeedDir:           envOr("TELESRV_PREMIUM_PROMO_SEED_DIR", "data/premium-promo"),
 		MapboxToken:                   envOr("TELESRV_MAPBOX_TOKEN", ""),
 		MapTileCacheDir:               envOr("TELESRV_MAPTILE_CACHE_DIR", "data/maptiles"),
 		ExternalMediaEnable:           envBoolOr("TELESRV_EXTERNAL_MEDIA_ENABLE", true),
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 64a345d1..bbbd093d 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -37,6 +37,22 @@ func TestLoadDefaultsAdvertiseIPToLoopback(t *testing.T) {
 	if cfg.CallRegistryMaxEntries != 10_000 {
 		t.Fatalf("CallRegistryMaxEntries = %d, want 10000", cfg.CallRegistryMaxEntries)
 	}
+	if cfg.PremiumPromoSeedDir != "data/premium-promo" {
+		t.Fatalf("PremiumPromoSeedDir = %q, want data/premium-promo", cfg.PremiumPromoSeedDir)
+	}
+}
+
+func TestLoadPremiumPromoSeedDirOverride(t *testing.T) {
+	disableDefaultConfigFile(t)
+	t.Setenv("TELESRV_PREMIUM_PROMO_SEED_DIR", `D:\seed\premium-promo`)
+
+	cfg, err := Load()
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if cfg.PremiumPromoSeedDir != `D:\seed\premium-promo` {
+		t.Fatalf("PremiumPromoSeedDir = %q", cfg.PremiumPromoSeedDir)
+	}
 }
 
 func TestLoadUsesExplicitAdvertiseIP(t *testing.T) {
diff --git a/internal/domain/premium.go b/internal/domain/premium.go
new file mode 100644
index 00000000..ff72aec7
--- /dev/null
+++ b/internal/domain/premium.go
@@ -0,0 +1,10 @@
+package domain
+
+// PremiumPromoCatalog is the immutable, domain-only media catalog returned by
+// help.getPremiumPromo. VideoSections[i] describes Videos[i]; callers must
+// preserve the one-to-one ordering because official clients use positional
+// lookup.
+type PremiumPromoCatalog struct {
+	VideoSections []string
+	Videos        []Document
+}
diff --git a/internal/rpc/auth_gate.go b/internal/rpc/auth_gate.go
index 682a668b..e2439861 100644
--- a/internal/rpc/auth_gate.go
+++ b/internal/rpc/auth_gate.go
@@ -55,7 +55,6 @@ func rpcAllowedWithoutAuthorization(id uint32) bool {
 		tg.HelpGetPeerProfileColorsRequestTypeID,
 		tg.HelpGetPromoDataRequestTypeID,
 		tg.HelpGetTermsOfServiceUpdateRequestTypeID,
-		tg.HelpGetPremiumPromoRequestTypeID,
 		tg.LangpackGetLanguagesRequestTypeID,
 		tg.LangpackGetLanguageRequestTypeID,
 		tg.LangpackGetLangPackRequestTypeID,
diff --git a/internal/rpc/deps.go b/internal/rpc/deps.go
index 431799ee..d44b47db 100644
--- a/internal/rpc/deps.go
+++ b/internal/rpc/deps.go
@@ -924,6 +924,13 @@ type ModerationService interface {
 	ReportAntiSpamFalsePositive(ctx context.Context, reporterUserID, channelID int64, messageID int, now time.Time) (domain.ModerationReport, bool, error)
 }
 
+// PremiumPromoService exposes the immutable promo media catalog through a
+// domain-only boundary. File bytes remain served by upload.getFile through the
+// ordinary Files service.
+type PremiumPromoService interface {
+	PremiumPromo(ctx context.Context) (domain.PremiumPromoCatalog, bool, error)
+}
+
 // Deps 按业务域注入服务接口。各域的 handler 注册见对应文件（auth.go / users.go / updates.go）。
 type Deps struct {
 	Auth                AuthService
@@ -956,6 +963,7 @@ type Deps struct {
 	Channels             ChannelsService
 	Communities          CommunitiesService
 	Files                FilesService
+	PremiumPromo         PremiumPromoService
 	Bots                 BotsService
 	Polls                PollsService
 	Phone                PhoneService
diff --git a/internal/rpc/help.go b/internal/rpc/help.go
index 011d4b43..c4021efc 100644
--- a/internal/rpc/help.go
+++ b/internal/rpc/help.go
@@ -176,11 +176,10 @@ func (r *Router) onHelpDismissSuggestion(ctx context.Context, req *tg.HelpDismis
 	return androidcompat.DismissSuggestion(req.Suggestion), nil
 }
 
-// onHelpGetPremiumPromo 返回最小真实的 Premium 状态页数据：状态文案按 viewer
-// 的会员有效期生成；videos/period_options 留空——购买入口已被 appConfig
-// premium_purchase_blocked=true 关闭，订阅价格 UI 不会消费这些字段（TDesktop
-// 空 period_options 仅隐藏价格按钮，DrKLO 回退到无价文案，均不报错）。
-// 六个字段全是 TL 必填项，空值也必须给出空集合而非缺失。
+// onHelpGetPremiumPromo returns the viewer-specific Premium status plus the
+// immutable, startup-seeded video catalog. Period options intentionally remain
+// empty: telesrv has no subscription purchase backend and must not advertise
+// dead payment URLs. All six TL fields are mandatory.
 func (r *Router) onHelpGetPremiumPromo(ctx context.Context) (*tg.HelpPremiumPromo, error) {
 	promo := &tg.HelpPremiumPromo{
 		StatusText:     branding.PremiumName + " is not active on this account.",
@@ -190,17 +189,42 @@ func (r *Router) onHelpGetPremiumPromo(ctx context.Context) (*tg.HelpPremiumProm
 		PeriodOptions:  []tg.PremiumSubscriptionOption{},
 		Users:          []tg.UserClass{},
 	}
-	userID, _, err := r.currentUserID(ctx)
-	if err != nil || r.deps.Users == nil {
-		return promo, nil
+	userID, authorized, err := r.currentUserID(ctx)
+	if err != nil {
+		return nil, internalErr()
+	}
+	if !authorized || userID == 0 {
+		return nil, authKeyUnregisteredErr()
+	}
+	if r.deps.Users == nil {
+		return nil, notImplementedErr()
 	}
 	u, err := r.deps.Users.Self(ctx, userID)
 	if err != nil {
-		return promo, nil
+		return nil, internalErr()
+	}
+	if u.ID != userID {
+		return nil, internalErr()
+	}
+	if u.Bot {
+		return nil, botMethodInvalidErr()
 	}
 	if u.PremiumActiveAt(r.clock.Now().Unix()) {
 		until := time.Unix(int64(u.PremiumUntil), 0)
 		promo.StatusText = branding.PremiumName + " is active until " + until.Format("2006-01-02") + "."
 	}
+	if r.deps.PremiumPromo != nil {
+		catalog, found, err := r.deps.PremiumPromo.PremiumPromo(ctx)
+		if err != nil {
+			return nil, internalErr()
+		}
+		if found {
+			if len(catalog.VideoSections) != len(catalog.Videos) {
+				return nil, internalErr()
+			}
+			promo.VideoSections = append([]string(nil), catalog.VideoSections...)
+			promo.Videos = tgDocuments(catalog.Videos)
+		}
+	}
 	return promo, nil
 }
diff --git a/internal/rpc/help_premium_promo_test.go b/internal/rpc/help_premium_promo_test.go
new file mode 100644
index 00000000..88e3ce79
--- /dev/null
+++ b/internal/rpc/help_premium_promo_test.go
@@ -0,0 +1,176 @@
+package rpc
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/iamxvbaba/td/tg"
+	"github.com/iamxvbaba/td/tgerr"
+	"github.com/iamxvbaba/td/tlprofile"
+	"go.uber.org/zap/zaptest"
+
+	"telesrv/internal/domain"
+)
+
+type staticPremiumPromoService struct {
+	catalog domain.PremiumPromoCatalog
+	found   bool
+	err     error
+}
+
+func (s staticPremiumPromoService) PremiumPromo(context.Context) (domain.PremiumPromoCatalog, bool, error) {
+	out := domain.PremiumPromoCatalog{
+		VideoSections: append([]string(nil), s.catalog.VideoSections...),
+		Videos:        append([]domain.Document(nil), s.catalog.Videos...),
+	}
+	for i := range out.Videos {
+		out.Videos[i].FileReference = append([]byte(nil), out.Videos[i].FileReference...)
+		out.Videos[i].Attributes = append([]domain.DocumentAttribute(nil), out.Videos[i].Attributes...)
+		out.Videos[i].Thumbs = append([]domain.PhotoSize(nil), out.Videos[i].Thumbs...)
+	}
+	return out, s.found, s.err
+}
+
+func TestHelpGetPremiumPromoReturnsSeededCatalogAcrossExactProfiles(t *testing.T) {
+	const userID int64 = 1000000001
+	now := time.Date(2026, 7, 26, 8, 0, 0, 0, time.UTC)
+	user := domain.User{
+		ID:           userID,
+		AccessHash:   17,
+		FirstName:    "Alice",
+		PremiumUntil: int(now.Add(48 * time.Hour).Unix()),
+	}
+	catalog := premiumPromoRPCTestCatalog()
+	r := New(Config{}, Deps{
+		Users:        staticUsersService{user: user},
+		PremiumPromo: staticPremiumPromoService{catalog: catalog, found: true},
+	}, zaptest.NewLogger(t), fixedClock{now: now})
+	ctx := WithUserID(context.Background(), userID)
+
+	for profile := tlprofile.Profile225; profile <= tlprofile.Profile228; profile++ {
+		t.Run(fmt.Sprintf("layer_%d", profile), func(t *testing.T) {
+			result, method := dispatchExactLayerRPCTest(t, r, ctx, profile, &tg.HelpGetPremiumPromoRequest{})
+			if method != "help.getPremiumPromo" {
+				t.Fatalf("method = %q", method)
+			}
+			promo, ok := dispatchCanonicalValue(result).(*tg.HelpPremiumPromo)
+			if !ok {
+				t.Fatalf("response = %T, want *tg.HelpPremiumPromo", dispatchCanonicalValue(result))
+			}
+			if len(promo.VideoSections) != 1 || promo.VideoSections[0] != "no_ads" || len(promo.Videos) != 1 {
+				t.Fatalf("promo vectors = sections:%v videos:%d", promo.VideoSections, len(promo.Videos))
+			}
+			doc, ok := promo.Videos[0].(*tg.Document)
+			if !ok {
+				t.Fatalf("video = %T, want *tg.Document", promo.Videos[0])
+			}
+			if doc.ID != catalog.Videos[0].ID || doc.DCID != 2 || len(doc.Thumbs) != 1 {
+				t.Fatalf("document = %+v", doc)
+			}
+			thumb, ok := doc.Thumbs[0].(*tg.PhotoSize)
+			if !ok || thumb.Type != "m" || thumb.Size != 1234 {
+				t.Fatalf("thumb = %#v", doc.Thumbs[0])
+			}
+			if len(promo.PeriodOptions) != 0 {
+				t.Fatalf("period options = %+v, want no dead purchase entry", promo.PeriodOptions)
+			}
+			if !strings.Contains(promo.StatusText, "2026-07-28") {
+				t.Fatalf("status text = %q, want viewer expiry", promo.StatusText)
+			}
+		})
+	}
+}
+
+func TestHelpGetPremiumPromoAuthorizationBotAndFallback(t *testing.T) {
+	const userID int64 = 1000000001
+	user := domain.User{ID: userID, AccessHash: 17, FirstName: "Alice"}
+	r := New(Config{}, Deps{
+		Users:        staticUsersService{user: user},
+		PremiumPromo: staticPremiumPromoService{},
+	}, zaptest.NewLogger(t), fixedClock{now: time.Unix(1_700_000_000, 0)})
+
+	if rpcAllowedWithoutAuthorization(tg.HelpGetPremiumPromoRequestTypeID) {
+		t.Fatal("help.getPremiumPromo must require a fully authorized user")
+	}
+	if _, err := r.onHelpGetPremiumPromo(context.Background()); !tgerr.Is(err, "AUTH_KEY_UNREGISTERED") {
+		t.Fatalf("unauthorized error = %v, want AUTH_KEY_UNREGISTERED", err)
+	}
+
+	promo, err := r.onHelpGetPremiumPromo(WithUserID(context.Background(), userID))
+	if err != nil {
+		t.Fatalf("fallback response: %v", err)
+	}
+	if len(promo.VideoSections) != 0 || len(promo.Videos) != 0 || len(promo.PeriodOptions) != 0 {
+		t.Fatalf("fallback vectors = %+v", promo)
+	}
+
+	botRouter := New(Config{}, Deps{
+		Users: staticUsersService{user: domain.User{
+			ID:         userID,
+			AccessHash: 19,
+			FirstName:  "PromoBot",
+			Bot:        true,
+		}},
+	}, zaptest.NewLogger(t), fixedClock{now: time.Unix(1_700_000_000, 0)})
+	if _, err := botRouter.onHelpGetPremiumPromo(WithUserID(context.Background(), userID)); !tgerr.Is(err, "BOT_METHOD_INVALID") {
+		t.Fatalf("bot error = %v, want BOT_METHOD_INVALID", err)
+	}
+}
+
+func TestHelpGetPremiumPromoResponsesDoNotShareMutableDocuments(t *testing.T) {
+	const userID int64 = 1000000001
+	catalog := premiumPromoRPCTestCatalog()
+	r := New(Config{}, Deps{
+		Users:        staticUsersService{user: domain.User{ID: userID}},
+		PremiumPromo: staticPremiumPromoService{catalog: catalog, found: true},
+	}, zaptest.NewLogger(t), fixedClock{now: time.Unix(1_700_000_000, 0)})
+	ctx := WithUserID(context.Background(), userID)
+
+	first, err := r.onHelpGetPremiumPromo(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	first.VideoSections[0] = "mutated"
+	firstDoc := first.Videos[0].(*tg.Document)
+	firstDoc.DCID = 99
+	firstDoc.FileReference[0] ^= 0xff
+
+	second, err := r.onHelpGetPremiumPromo(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	secondDoc := second.Videos[0].(*tg.Document)
+	if second.VideoSections[0] != "no_ads" || secondDoc.DCID != 2 || secondDoc.FileReference[0] != 0 {
+		t.Fatalf("second response inherited mutation: sections=%v doc=%+v", second.VideoSections, secondDoc)
+	}
+}
+
+func premiumPromoRPCTestCatalog() domain.PremiumPromoCatalog {
+	return domain.PremiumPromoCatalog{
+		VideoSections: []string{"no_ads"},
+		Videos: []domain.Document{{
+			ID:            5814500255441357739,
+			AccessHash:    5876417653416908580,
+			FileReference: []byte{0, 1, 2, 3},
+			Date:          1_654_006_663,
+			MimeType:      "video/mp4",
+			Size:          2_650_178,
+			DCID:          2,
+			Attributes: []domain.DocumentAttribute{
+				{Kind: domain.DocAttrFilename, FileName: "promo.mp4"},
+				{Kind: domain.DocAttrVideo, W: 720, H: 1070, Duration: 5, SupportsStreaming: true},
+				{Kind: domain.DocAttrAnimated},
+			},
+			Thumbs: []domain.PhotoSize{{
+				Kind: domain.PhotoSizeKindDefault,
+				Type: "m",
+				W:    160,
+				H:    240,
+				Size: 1234,
+			}},
+		}},
+	}
+}