diff --git a/app/share/[id]/page.tsx b/app/share/[id]/page.tsx
index d5692173..730f70dc 100644
--- a/app/share/[id]/page.tsx
+++ b/app/share/[id]/page.tsx
@@ -989,15 +989,16 @@ export default function SharePage() {
 
   const openTaskDetailRenameDialog = (asset: { id: string; fileName?: string }) => {
     const currentName = asset.fileName || ''
-    const dotIndex = currentName.lastIndexOf('.')
-    const baseName = dotIndex > 0 ? currentName.slice(0, dotIndex) : currentName
-    const extension = dotIndex > 0 ? currentName.slice(dotIndex) : ''
+    // 预览行文件名不是包内条目名：剥掉 .webp 与历史「源名-preview」尾巴，
+    // 扩展名由服务端按包内条目自动保留，前端不预设（预设 .webp 会误触扩展名校验）。
+    let displayBase = currentName.replace(/\.webp$/i, '')
+    displayBase = displayBase.replace(/-preview$/i, '')
     setRenameDialogState({
       assetId: asset.id,
       currentName,
-      baseName,
-      extension,
-      value: baseName,
+      baseName: displayBase,
+      extension: '',
+      value: displayBase,
       error: null,
       saving: false,
     })
@@ -1023,7 +1024,7 @@ export default function SharePage() {
       assetId: renameDialogState.assetId,
       kind: 'rename',
       label: `重命名为 ${nextBaseName}${renameDialogState.extension}`,
-      newFileName: nextBaseName + renameDialogState.extension,
+      newFileName: nextBaseName,
     })
     showToast('重命名已加入待应用清单', { variant: 'success' })
     setRenameDialogState(null)
@@ -1853,7 +1854,7 @@ export default function SharePage() {
                 aria-label="新文件名"
               />
               <span className="flex min-h-10 items-center rounded-r-[8px] border border-[#e7e8ea] bg-[#fafafa] px-2.5 text-[13px] text-[#86898e]">
-                {renameDialogState.extension || '（无扩展名）'}
+                保存后自动沿用原扩展名
               </span>
             </div>
             {renameDialogState.error && (