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lib/upload_image/look_images_widget.dart

@@ -170,6 +170,7 @@ class _LookImagesWidgetState extends State<LookImagesWidget> {
 
   /// Uint8List 转临时 File 并且上传到oss并返回访问路径
   Future<String?> uint8ListToTempFile(Uint8List uint8List, {String fileName = "temp_file"}) async {
+    if (uint8List.isEmpty) return null;
     try {
       // 1. 获取临时存储目录（跨平台兼容）
       Directory tempDir = await getTemporaryDirectory();