fix

main.py

@@ -336,6 +336,15 @@ async def perform_file_action(
         if files["files"] is None:
             await update.message.reply_text("❌未找到文件!!")
         else:
+            if files["files"]["parent_id"] is not None:
+                 keyboard.append(
+                        [
+                            InlineKeyboardButton(
+                                f"返回上级",
+                                callback_data=f"list_file:{files["files"]["parent_id"]}",
+                            ),
+                        ]
+                    )
             # 为每个文件创建按钮和操作选项
             for file in files["files"]:
                 if file["kind"].lower() == "drive#folder":