diff --git a/frontend/app.html b/frontend/app.html
index 435bbcc..e47d1a9 100644
--- a/frontend/app.html
+++ b/frontend/app.html
@@ -193,6 +193,12 @@
     .file-icon {
       margin-bottom: 10px;
     }
+    .file-thumbnail {
+      width: 64px;
+      height: 64px;
+      object-fit: cover;
+      border-radius: 8px;
+    }
     .file-name {
       font-size: 13px;
       color: #333;
@@ -332,6 +338,11 @@
       .file-icon i {
         font-size: 48px !important;
       }
+      /* 图片缩略图移动端适配 */
+      .file-thumbnail {
+        width: 48px !important;
+        height: 48px !important;
+      }
       /* 视频图标容器移动端适配 */
       .file-icon div[style*="background: linear-gradient"] {
         width: 48px !important;
@@ -714,8 +725,7 @@
                 <img v-if="file.name.match(/\.(jpg|jpeg|png|gif|bmp|svg|webp)$/i) && getThumbnailUrl(file)" 
                      :src="getThumbnailUrl(file)" 
                      :alt="file.name"
-                     class="file-thumbnail"
-                     style="width: 64px; height: 64px; object-fit: cover; border-radius: 8px;">
+                     class="file-thumbnail">
                 <!-- 视频图标（不预加载，避免慢） -->
                 <div v-else-if="file.name.match(/\.(mp4|avi|mov|wmv|flv|mkv|webm)$/i)" 
                      style="width: 64px; height: 64px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border-radius: 8px; display: flex; align-items: center; justify-content: center; position: relative;">
@@ -995,7 +1005,7 @@
         </div>
 
         <!-- SFTP配置 - 仅普通用户且权限允许SFTP -->
-        <div v-if="user && !user.is_admin && (storagePermission === 'sftp_only' || storagePermission === 'user_choice')">
+        <div v-if="user && !user.is_admin && (storagePermission === 'sftp_only' || (storagePermission === 'user_choice' && storageType === 'sftp'))">
           <h3 style="margin-bottom: 20px;">SFTP配置</h3>
           <div v-if="user && !user.has_ftp_config" class="alert alert-info">
             请配置SFTP服务器