diff --git a/admin/src/api/admin.js b/admin/src/api/admin.js
index 7421be3..b8eb39b 100644
--- a/admin/src/api/admin.js
+++ b/admin/src/api/admin.js
@@ -78,6 +78,7 @@ export const uploadSiteAsset = (siteId, file, opts = {}) => {
   form.append('file', file)
   if (opts.folder != null) form.append('folder', opts.folder)
   form.append('downloadable', opts.downloadable ? 'true' : 'false')
+  if (opts.preserveFilename) form.append('preserve_filename', 'true')
   return request.post(`/admin/sites/${siteId}/assets`, form, { headers: { 'Content-Type': 'multipart/form-data' } })
 }
 export const createSiteFolder = (siteId, path) => request.post(`/admin/sites/${siteId}/folders`, { path })
diff --git a/admin/src/views/files/FileManage.vue b/admin/src/views/files/FileManage.vue
index 1c24d06..ebaecfd 100644
--- a/admin/src/views/files/FileManage.vue
+++ b/admin/src/views/files/FileManage.vue
@@ -56,11 +56,15 @@
     </el-card>
 
     <!-- 上传前选择是否可下载 -->
-    <el-dialog v-model="uploadDialogVisible" title="上传文件" width="400px" :close-on-click-modal="false">
-      <el-form label-width="100px">
+    <el-dialog v-model="uploadDialogVisible" title="上传文件" width="440px" :close-on-click-modal="false">
+      <el-form label-width="112px">
         <el-form-item label="当前目录">
           <span>{{ currentPath || '根目录' }}</span>
         </el-form-item>
+        <el-form-item label="保留原文件名">
+          <el-switch v-model="uploadPreserveFilename" />
+          <span class="form-hint">开启后覆盖同路径同名文件；首页「产品视频」须上传到 <code>promotion/视频发布/…</code> 并开启此项</span>
+        </el-form-item>
         <el-form-item label="允许下载">
           <el-switch v-model="uploadDownloadable" />
         </el-form-item>
@@ -100,7 +104,8 @@ const loading = ref(false)
 const currentPath = ref('')
 const uploading = ref(false)
 const uploadDialogVisible = ref(false)
-const uploadDownloadable = ref(true)
+const uploadDownloadable = ref(false)
+const uploadPreserveFilename = ref(false)
 const pendingFile = ref(null)
 const showNewFolder = ref(false)
 const newFolderName = ref('')
@@ -152,7 +157,9 @@ watch([siteId, currentPath], fetchList)
 
 const beforeUpload = (file) => {
   pendingFile.value = file
-  uploadDownloadable.value = true
+  const p = (currentPath.value || '').replace(/^\//, '')
+  uploadPreserveFilename.value = p.startsWith('promotion/')
+  uploadDownloadable.value = !uploadPreserveFilename.value
   uploadDialogVisible.value = true
   return false
 }
@@ -163,7 +170,8 @@ const doUpload = async () => {
   try {
     await uploadSiteAsset(siteId.value, pendingFile.value, {
       folder: currentPath.value || undefined,
-      downloadable: uploadDownloadable.value
+      downloadable: uploadDownloadable.value,
+      preserveFilename: uploadPreserveFilename.value
     })
     ElMessage.success('上传成功')
     uploadDialogVisible.value = false
@@ -216,6 +224,8 @@ onMounted(() => fetchSites().then(() => fetchList()))
 
 <style scoped>
 .file-manage .tip { color: #666; font-size: 14px; }
+.form-hint { display: block; margin-top: 6px; font-size: 12px; color: #909399; line-height: 1.4; }
+.form-hint code { font-size: 11px; }
 .module-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
 .breadcrumb-wrap { margin-top: 12px; }
 .subdirs { margin-top: 8px; font-size: 13px; color: #666; }
diff --git a/nginx/yuheng.docker.conf b/nginx/yuheng.docker.conf
index 977e6f5..845cddf 100644
--- a/nginx/yuheng.docker.conf
+++ b/nginx/yuheng.docker.conf
@@ -4,7 +4,7 @@ server {
     listen 443 ssl http2;
     listen [::]:443 ssl http2;
     server_name yuheng.yuxindazhineng.com;
-    client_max_body_size 200m;
+    client_max_body_size 800m;
 
     ssl_certificate     /etc/ssl/yh_web/yuheng.yuxindazhineng.com/fullchain.pem;
     ssl_certificate_key /etc/ssl/yh_web/yuheng.yuxindazhineng.com/privkey.pem;
diff --git a/server/handlers/module_upload.go b/server/handlers/module_upload.go
index 2ec84b9..a18f604 100644
--- a/server/handlers/module_upload.go
+++ b/server/handlers/module_upload.go
@@ -153,7 +153,61 @@ func listSubDirs(c *gin.Context, siteID, currentPath string) []string {
 	return names
 }
 
-// UploadSiteAsset 上传功能模块/文件；form 可选：folder（当前目录相对路径）、downloadable（true/false）
+func promotionMimeType(ext string) string {
+	switch strings.ToLower(ext) {
+	case ".mov":
+		return "video/quicktime"
+	case ".mp4":
+		return "video/mp4"
+	case ".webm":
+		return "video/webm"
+	case ".jpg", ".jpeg":
+		return "image/jpeg"
+	case ".png":
+		return "image/png"
+	case ".gif":
+		return "image/gif"
+	default:
+		return ""
+	}
+}
+
+// ServePromotionMedia 公开读取站点 uploads/sites/{site_id}/promotion/ 下文件（与后台上传到 promotion/… 目录对应）
+func ServePromotionMedia(c *gin.Context) {
+	siteID := c.Param("site_id")
+	raw := strings.TrimPrefix(c.Param("filepath"), "/")
+	if siteID == "" || raw == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "参数错误"})
+		return
+	}
+	rel := filepath.ToSlash(filepath.Clean(raw))
+	if rel == "." || strings.HasPrefix(rel, "../") || strings.Contains(rel, "/../") {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效路径"})
+		return
+	}
+	baseDir := filepath.Join(getUploadDir(), "sites", siteID, "promotion")
+	fullPath := filepath.Join(baseDir, filepath.FromSlash(rel))
+	relBack, err := filepath.Rel(baseDir, fullPath)
+	if err != nil || strings.HasPrefix(relBack, "..") {
+		c.JSON(http.StatusForbidden, gin.H{"error": "禁止访问"})
+		return
+	}
+	fi, err := os.Stat(fullPath)
+	if err != nil || fi.IsDir() {
+		c.JSON(http.StatusNotFound, gin.H{"error": "文件不存在"})
+		return
+	}
+	ext := filepath.Ext(fullPath)
+	ct := promotionMimeType(ext)
+	if ct == "" {
+		ct = "application/octet-stream"
+	}
+	c.Header("Content-Type", ct)
+	c.Header("Cache-Control", "public, max-age=86400")
+	c.File(fullPath)
+}
+
+// UploadSiteAsset 上传功能模块/文件；form 可选：folder（当前目录相对路径）、downloadable（true/false）、preserve_filename（true 时保持原名并覆盖同路径旧文件，用于首页推广视频固定 URL）
 func UploadSiteAsset(c *gin.Context) {
 	siteID := c.Param("site_id")
 	if siteID == "" {
@@ -167,22 +221,59 @@ func UploadSiteAsset(c *gin.Context) {
 		return
 	}
 
-	folder := c.PostForm("folder")
+	folder := strings.TrimSpace(c.PostForm("folder"))
 	downloadable := c.PostForm("downloadable") == "true" || c.PostForm("downloadable") == "1"
-	baseDir := filepath.Join(getUploadDir(), "sites", siteID, filepath.Clean(folder))
+	preserve := c.PostForm("preserve_filename") == "true" || c.PostForm("preserve_filename") == "1"
+
+	name := file.Filename
+	ext := filepath.Ext(name)
+	nameNoExt := strings.TrimSuffix(name, ext)
+	var saveName string
+	if preserve {
+		saveName = filepath.Base(name)
+		if saveName == "." || saveName == string(filepath.Separator) || saveName == "" {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "无效的文件名"})
+			return
+		}
+	} else {
+		if len(ext) == 0 {
+			saveName = nameNoExt + "_" + time.Now().Format("20060102150405")
+		} else {
+			saveName = nameNoExt + "_" + time.Now().Format("20060102150405") + ext
+		}
+	}
+
+	folderClean := ""
+	if folder != "" {
+		folderClean = filepath.ToSlash(filepath.Clean(folder))
+		if strings.HasPrefix(folderClean, "../") || strings.Contains(folderClean, "/../") {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "无效的目录路径"})
+			return
+		}
+	}
+
+	var relPath string
+	if folderClean != "" {
+		relPath = filepath.ToSlash(filepath.Join("sites", siteID, folderClean, saveName))
+	} else {
+		relPath = filepath.ToSlash(filepath.Join("sites", siteID, saveName))
+	}
+	destPath := filepath.Join(getUploadDir(), filepath.FromSlash(relPath))
+
+	if preserve {
+		ctxDel, cancelDel := context.WithTimeout(context.Background(), 8*time.Second)
+		defer cancelDel()
+		coll := config.GetDB(config.DBName).Collection("site_assets")
+		_, _ = coll.DeleteMany(ctxDel, bson.M{"site_id": siteID, "file_path": relPath})
+		_ = os.Remove(destPath)
+	}
+
+	baseDir := filepath.Dir(destPath)
 	if err := os.MkdirAll(baseDir, 0755); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "创建目录失败"})
 		return
 	}
 
-	name := file.Filename
-	ext := filepath.Ext(name)
-	nameNoExt := name[:len(name)-len(ext)]
-	saveName := nameNoExt + "_" + time.Now().Format("20060102150405") + ext
-	relPath := filepath.Join("sites", siteID, filepath.Clean(folder), saveName)
-	relPath = filepath.ToSlash(relPath)
-	destPath := filepath.Join(getUploadDir(), filepath.FromSlash(relPath))
-
 	if err := c.SaveUploadedFile(file, destPath); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "保存文件失败"})
 		return
diff --git a/server/main.go b/server/main.go
index 7911c13..0e2ea04 100644
--- a/server/main.go
+++ b/server/main.go
@@ -79,7 +79,7 @@ func main() {
 	}
 
 	r := gin.Default()
-	r.MaxMultipartMemory = 200 << 20 // 200MB，与 Nginx client_max_body_size 一致，避免上传 413
+	r.MaxMultipartMemory = 32 << 20 // 大单片先落临时文件；整体体积受 Nginx client_max_body_size 限制
 	r.Use(middleware.ErrorLogger())
 
 	// CORS（ALLOWED_ORIGINS 为空则允许所有来源；否则仅允许配置的域名）
@@ -215,6 +215,8 @@ func main() {
 		web.GET("/info", func(c *gin.Context) {
 			c.JSON(http.StatusOK, gin.H{"message": "web api"})
 		})
+		// 推广/产品视频：站点 uploads 下 promotion 目录（无需鉴权，与后台上传到 promotion/… 对应）
+		web.GET("/sites/:site_id/promotion-media/*filepath", handlers.ServePromotionMedia)
 		// 可下载资源公开下载（首页等链接指向此路径）
 		web.GET("/sites/:site_id/assets/:asset_id/download", handlers.DownloadSiteAsset)
 	}
diff --git a/web/promotion/README.md b/web/promotion/README.md
index 8a8aa4a..a5dd7fd 100644
--- a/web/promotion/README.md
+++ b/web/promotion/README.md
@@ -1,8 +1,7 @@
 # 推广素材（首页与视频源）
 
 - `index.html`：静态完整落地页参考；线上 Vue 首页已与之对齐，素材路径以本目录为准。
-- `视频发布/`：产品视频与封面，首页「产品视频」区块使用下列相对路径（经 `promotionUrl` 转为 URL）：
-  - `/promotion/视频发布/...`
+- `视频发布/`：产品视频与封面。**`.mov` 等大文件默认不入 Git**；生产环境请在 **后台 → 文件管理** 上传到 `promotion/视频发布/…`，勾选 **保留原文件名**（路径与文件名见 `视频发布/README.md`）。官网解析到站点后，首页通过 `/api/web/sites/{site_id}/promotion-media/视频发布/...` 拉取。本地开发仍可将文件放在本目录，走 `/promotion/视频发布/...`。
 - `social/`：**关注我们** 统一资源包（建议只用此目录上线），首页读取：
   - `social/xiaohongshu.png`、`social/douyin.png`、`social/wechat-official.png`、`social/wechat-channels.jpg`
   - 源文件可从根目录 `小红书.png`、`抖音.png`、`公众号.png`、`视频号.jpg` 同步复制进来（ASCII 文件名利于网关与日志）。
@@ -10,7 +9,7 @@
 
 ## 生产部署
 
-1. **前端构建产物**（`dist/`）不包含本目录。部署时请把本文件夹 **完整复制** 到站点根下，与 `index.html` 同级，目录名为 `promotion`（即能通过 `https://你的域名/promotion/视频发布/...` 访问视频）。
+1. **前端构建产物**（`dist/`）不包含本目录。除视频外请把需要的素材 **复制** 到站点根下 `promotion/`（如 `social/`、宣传册相关），或通过 Nginx alias。**视频**推荐仅通过后台上传到 API 存储目录，无需再拷 `.mov` 到静态服务器。
 2. 或使用 Nginx：
 
 ```nginx
diff --git a/web/promotion/视频发布/README.md b/web/promotion/视频发布/README.md
new file mode 100644
index 0000000..c51b992
--- /dev/null
+++ b/web/promotion/视频发布/README.md
@@ -0,0 +1,26 @@
+# 产品视频目录
+
+大体积 **`.mov` 视频不入 Git**。线上由官网 **后台 → 文件管理** 上传到站点下的 `promotion/视频发布/...`，与首页「产品视频」使用的路径一致。
+
+## 上传步骤
+
+1. 打开 **后台**，进入 **文件管理 → 功能模块**。
+2. 选择 **官网站点**（与系统设置中的「官网」站点一致）。
+3. 新建或使用目录：`promotion/视频发布/<子目录名>/`（与下列清单一致）。
+4. 上传对应 **封面 `.jpg`** 与 **视频 `.mov`** 时，请勾选 **「保留原文件名」**，文件名必须与下列清单完全一致（否则首页无法匹配）。
+
+## 文件清单（相对 `promotion/`）
+
+| 子目录 | 封面文件 | 视频文件 |
+|--------|----------|----------|
+| `视频发布/宇恒一号操作计算软件实例（一）` | `宣传片-封面.jpg` | `宣传片.mov` |
+| `视频发布/宇恒一号操作计算软件实例（二）` | `宇恒一号操作计算软件实例（二）-封面.jpg` | `宇恒一号操作计算软件实例（二）.mov` |
+| `视频发布/宇恒一号AIWord简介` | `宇恒一号AIWord简介-封面.jpg` | `宇恒一号AIWord简介.mov` |
+| `视频发布/宇恒一号语音办公实例` | `宇恒一号语音办公实例-封面.jpg` | `宇恒一号语音办公实例.mov` |
+| `视频发布/宇恒一号，AI 全自动办发票` | `宇恒一号，AI 全自动办发票-封面.jpg` | `宇恒一号，AI 全自动办发票.mov` |
+
+（若表内「封面」文件名与代码中 `web/src/data/promotionVideos.js` 不一致，以代码中的 `relCover` / `relVideo` 为准。）
+
+## 本地开发
+
+若仅在本地调试，仍可将视频放在本目录，Vite 开发服务器会通过 `/promotion/...` 直接读本地文件。
diff --git a/web/promotion/视频发布/宇恒一号AIWord简介/宇恒一号AIWord简介-封面.jpg b/web/promotion/视频发布/宇恒一号AIWord简介/宇恒一号AIWord简介-封面.jpg
deleted file mode 100644
index dde8cd3..0000000
Binary files a/web/promotion/视频发布/宇恒一号AIWord简介/宇恒一号AIWord简介-封面.jpg and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号AIWord简介/宇恒一号AIWord简介.mov b/web/promotion/视频发布/宇恒一号AIWord简介/宇恒一号AIWord简介.mov
deleted file mode 100644
index 37af645..0000000
Binary files a/web/promotion/视频发布/宇恒一号AIWord简介/宇恒一号AIWord简介.mov and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号操作计算软件实例（一）/宣传片-封面.jpg b/web/promotion/视频发布/宇恒一号操作计算软件实例（一）/宣传片-封面.jpg
deleted file mode 100644
index e84132b..0000000
Binary files a/web/promotion/视频发布/宇恒一号操作计算软件实例（一）/宣传片-封面.jpg and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号操作计算软件实例（一）/宣传片.mov b/web/promotion/视频发布/宇恒一号操作计算软件实例（一）/宣传片.mov
deleted file mode 100644
index 2179571..0000000
Binary files a/web/promotion/视频发布/宇恒一号操作计算软件实例（一）/宣传片.mov and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）-封面.jpg b/web/promotion/视频发布/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）-封面.jpg
deleted file mode 100644
index 84c1746..0000000
Binary files a/web/promotion/视频发布/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）-封面.jpg and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）.mov b/web/promotion/视频发布/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）.mov
deleted file mode 100644
index 68f8e38..0000000
Binary files a/web/promotion/视频发布/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）.mov and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号语音办公实例/宇恒一号语音办公实例-封面.jpg b/web/promotion/视频发布/宇恒一号语音办公实例/宇恒一号语音办公实例-封面.jpg
deleted file mode 100644
index c5cb0af..0000000
Binary files a/web/promotion/视频发布/宇恒一号语音办公实例/宇恒一号语音办公实例-封面.jpg and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号语音办公实例/宇恒一号语音办公实例.mov b/web/promotion/视频发布/宇恒一号语音办公实例/宇恒一号语音办公实例.mov
deleted file mode 100644
index 3ef2fb6..0000000
Binary files a/web/promotion/视频发布/宇恒一号语音办公实例/宇恒一号语音办公实例.mov and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票-封面.jpg b/web/promotion/视频发布/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票-封面.jpg
deleted file mode 100644
index cd3a671..0000000
Binary files a/web/promotion/视频发布/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票-封面.jpg and /dev/null differ
diff --git a/web/promotion/视频发布/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票.mov b/web/promotion/视频发布/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票.mov
deleted file mode 100644
index 1d83cdc..0000000
Binary files a/web/promotion/视频发布/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票.mov and /dev/null differ
diff --git a/web/src/data/promotionVideos.js b/web/src/data/promotionVideos.js
index a33090f..bf0526c 100644
--- a/web/src/data/promotionVideos.js
+++ b/web/src/data/promotionVideos.js
@@ -1,42 +1,56 @@
-import { promotionUrl } from '../utils/promotionAssets'
+import { promotionUrl, promotionMediaApiUrl } from '../utils/promotionAssets'
 
 const ROOT = '视频发布'
 
-/** 与 web/promotion/视频发布 目录结构一致 */
-export const PROMOTION_VIDEOS = [
+/** 相对 `promotion/` 的路径；与后台上传目录 promotion/视频发布/… +「保留原文件名」一致 */
+export const PROMOTION_VIDEOS_BASE = [
   {
     id: 'calc-demo-1',
     title: '操作与计算软件实例（一）',
     desc: '宇恒一号宣传片',
-    cover: promotionUrl(`${ROOT}/宇恒一号操作计算软件实例（一）/宣传片-封面.jpg`),
-    src: promotionUrl(`${ROOT}/宇恒一号操作计算软件实例（一）/宣传片.mov`)
+    relCover: `${ROOT}/宇恒一号操作计算软件实例（一）/宣传片-封面.jpg`,
+    relVideo: `${ROOT}/宇恒一号操作计算软件实例（一）/宣传片.mov`
   },
   {
     id: 'calc-demo-2',
     title: '操作与计算软件实例（二）',
     desc: '进阶操作与计算演示',
-    cover: promotionUrl(`${ROOT}/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）-封面.jpg`),
-    src: promotionUrl(`${ROOT}/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）.mov`)
+    relCover: `${ROOT}/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）-封面.jpg`,
+    relVideo: `${ROOT}/宇恒一号操作计算软件实例（二）/宇恒一号操作计算软件实例（二）.mov`
   },
   {
     id: 'aiword',
     title: '宇恒一号 AI Word 简介',
     desc: 'AI Word 能力介绍',
-    cover: promotionUrl(`${ROOT}/宇恒一号AIWord简介/宇恒一号AIWord简介-封面.jpg`),
-    src: promotionUrl(`${ROOT}/宇恒一号AIWord简介/宇恒一号AIWord简介.mov`)
+    relCover: `${ROOT}/宇恒一号AIWord简介/宇恒一号AIWord简介-封面.jpg`,
+    relVideo: `${ROOT}/宇恒一号AIWord简介/宇恒一号AIWord简介.mov`
   },
   {
     id: 'voice',
     title: '语音办公实例',
     desc: '语音驱动办公流程',
-    cover: promotionUrl(`${ROOT}/宇恒一号语音办公实例/宇恒一号语音办公实例-封面.jpg`),
-    src: promotionUrl(`${ROOT}/宇恒一号语音办公实例/宇恒一号语音办公实例.mov`)
+    relCover: `${ROOT}/宇恒一号语音办公实例/宇恒一号语音办公实例-封面.jpg`,
+    relVideo: `${ROOT}/宇恒一号语音办公实例/宇恒一号语音办公实例.mov`
   },
   {
     id: 'invoice',
     title: 'AI 全自动办发票',
     desc: '发票场景自动化演示',
-    cover: promotionUrl(`${ROOT}/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票-封面.jpg`),
-    src: promotionUrl(`${ROOT}/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票.mov`)
+    relCover: `${ROOT}/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票-封面.jpg`,
+    relVideo: `${ROOT}/宇恒一号，AI 全自动办发票/宇恒一号，AI 全自动办发票.mov`
   }
 ]
+
+/** @param {string} siteId 空串时走本地/静态 /promotion/… */
+export function buildPromotionVideos(siteId) {
+  return PROMOTION_VIDEOS_BASE.map((v) => ({
+    id: v.id,
+    title: v.title,
+    desc: v.desc,
+    cover: promotionMediaApiUrl(siteId, v.relCover),
+    src: promotionMediaApiUrl(siteId, v.relVideo)
+  }))
+}
+
+/** @deprecated 请用 buildPromotionVideos(siteId)；保留兼容旧引用 */
+export const PROMOTION_VIDEOS = buildPromotionVideos('')
diff --git a/web/src/utils/promotionAssets.js b/web/src/utils/promotionAssets.js
index 42ea6a6..546d0ff 100644
--- a/web/src/utils/promotionAssets.js
+++ b/web/src/utils/promotionAssets.js
@@ -1,8 +1,23 @@
+import { apiBase } from '../config'
+
 /**
  * 推广素材根路径。开发时由 Vite 插件映射到 web/promotion；
- * 生产构建请把 web/promotion 整目录同步到站点 /promotion（或配置 Nginx alias）。
+ * 生产环境视频默认走后台上传：`/api/web/sites/{siteId}/promotion-media/...`（见 buildPromotionVideos）。
  */
 export function promotionUrl(relativePath) {
   const parts = String(relativePath).split('/').filter(Boolean)
   return '/promotion/' + parts.map(encodeURIComponent).join('/')
 }
+
+/**
+ * 官网产品视频/封面：读取站点 uploads 下 `promotion/` 目录（与后台上传路径一致）
+ * @param {string} siteId Mongo 站点 id（与 /api/web/routes 返回的 site_id 一致）
+ * @param {string} relativePath 相对 promotion/ 的路径，如 `视频发布/xxx/yyy.mov`
+ */
+export function promotionMediaApiUrl(siteId, relativePath) {
+  if (!siteId) return promotionUrl(relativePath)
+  const root = (apiBase || '').replace(/\/$/, '')
+  const prefix = root ? `${root}/api` : '/api'
+  const parts = String(relativePath).split(/[/\\]/).filter(Boolean).map(encodeURIComponent).join('/')
+  return `${prefix}/web/sites/${siteId}/promotion-media/${parts}`
+}
diff --git a/web/src/views/Home.vue b/web/src/views/Home.vue
index 6280432..ed1dfc0 100644
--- a/web/src/views/Home.vue
+++ b/web/src/views/Home.vue
@@ -213,11 +213,11 @@
     <section class="video-section" id="videos">
       <div class="section-title">
         <h2>产品视频</h2>
-        <p>内容为「视频发布」文件夹中的正式素材，点击即可播放</p>
+        <p>视频由后台上传至 <code class="social-code">promotion/视频发布/</code>，需勾选「保留原文件名」；未上传时本地开发可走 <code class="social-code">/promotion/…</code></p>
       </div>
       <div class="video-container">
         <div class="video-wrapper">
-          <div class="video-card main-video">
+          <div v-if="activeVideo" class="video-card main-video">
             <div
               class="video-thumbnail main-thumb"
               :style="mainVideoCoverStyle"
@@ -238,7 +238,7 @@
             v-for="v in promoVideos"
             :key="v.id"
             class="video-card small-video"
-            :class="{ 'is-active': activeVideo.id === v.id }"
+            :class="{ 'is-active': activeVideo && activeVideo.id === v.id }"
             @click="selectVideo(v)"
           >
             <div
@@ -309,11 +309,12 @@
 </template>
 
 <script setup>
-import { ref, reactive, computed, onMounted, onUnmounted, nextTick } from 'vue'
+import { ref, reactive, computed, watch, onMounted, onUnmounted, nextTick } from 'vue'
 import { apiBase } from '../config'
 import BlockRenderer from '../components/blocks/BlockRenderer.vue'
-import { PROMOTION_VIDEOS } from '../data/promotionVideos'
+import { buildPromotionVideos } from '../data/promotionVideos'
 import { PROMOTION_SOCIAL_FOLLOW } from '../data/promotionSocial'
+import { getCachedWebSiteId, fetchWebRoutes } from '../api/webPages'
 
 const socialFollowItems = PROMOTION_SOCIAL_FOLLOW
 
@@ -321,8 +322,19 @@ const starsEl = ref(null)
 let cometTimer = null
 const scrollY = ref(0)
 const openFaq = ref(0)
-const promoVideos = PROMOTION_VIDEOS
-const activeVideo = ref(promoVideos[0])
+/** 官网 site_id（bootstrap 已拉路由时此处已有值；为空则产品视频走本地 /promotion） */
+const webSiteId = ref(getCachedWebSiteId() || '')
+const promoVideos = computed(() => buildPromotionVideos(webSiteId.value))
+const activeVideo = ref(null)
+watch(
+  promoVideos,
+  (list) => {
+    if (!list.length) return
+    const cur = activeVideo.value
+    if (!cur || !list.some((v) => v.id === cur.id)) activeVideo.value = list[0]
+  },
+  { immediate: true }
+)
 const videoModalOpen = ref(false)
 const modalVideoSrc = ref('')
 const modalCaption = ref('')
@@ -385,11 +397,14 @@ const navbarStyle = computed(() => {
   return { background: 'linear-gradient(180deg, rgba(10,10,18,0.95) 0%, transparent 100%)', boxShadow: 'none' }
 })
 
-const mainVideoCoverStyle = computed(() => ({
-  backgroundImage: 'url(' + activeVideo.value.cover + ')',
-  backgroundSize: 'cover',
-  backgroundPosition: 'center'
-}))
+const mainVideoCoverStyle = computed(() => {
+  const v = activeVideo.value
+  return {
+    backgroundImage: v ? 'url(' + v.cover + ')' : 'none',
+    backgroundSize: 'cover',
+    backgroundPosition: 'center'
+  }
+})
 
 const bodyBuilderBlocks = computed(() => {
   const raw = data.body_builder
@@ -569,6 +584,11 @@ function onDocKeydown(e) {
 }
 
 onMounted(() => {
+  if (!webSiteId.value) {
+    fetchWebRoutes().then(() => {
+      webSiteId.value = getCachedWebSiteId() || ''
+    })
+  }
   fetchHomepage()
   document.title = (data.title || '宇恒一号') + ' - 星际探索版'
   window.addEventListener('scroll', onScroll, { passive: true })