diff --git a/api/app/services/app_chat_service.py b/api/app/services/app_chat_service.py
index b0d90643..3f4bc007 100644
--- a/api/app/services/app_chat_service.py
+++ b/api/app/services/app_chat_service.py
@@ -187,7 +187,7 @@ class AppChatService:
             "usage": result.get("usage", {"prompt_tokens": 0, "completion_tokens": 0, "total_tokens": 0}),
             "audio_url": None
         }
-        if files:
+        if processed_files:
             human_meta["files"].extend(processed_files)
 
         # 保存消息
@@ -395,13 +395,8 @@ class AppChatService:
                 "audio_url": None
             }
 
-            if files:
-                for f in files:
-                    # url = await MultimodalService(self.db).get_file_url(f)
-                    human_meta["files"].append({
-                        "type": f.type,
-                        "url": f.url
-                    })
+            if processed_files:
+                human_meta["files"].extend(processed_files)
 
             if stream_audio_url:
                 assistant_meta["audio_url"] = stream_audio_url
diff --git a/api/app/services/draft_run_service.py b/api/app/services/draft_run_service.py
index 10ec25d9..0af33357 100644
--- a/api/app/services/draft_run_service.py
+++ b/api/app/services/draft_run_service.py
@@ -820,7 +820,6 @@ class AgentRunService:
                 conversation_id=conversation_id,
                 max_history=memory_config.get("max_history", 10)
             )
-            print(history)
 
             # 6. 处理多模态文件
             processed_files = None
diff --git a/api/app/services/multimodal_service.py b/api/app/services/multimodal_service.py
index e11a8d2b..e7fb3de3 100644
--- a/api/app/services/multimodal_service.py
+++ b/api/app/services/multimodal_service.py
@@ -713,7 +713,8 @@ class MultimodalService:
 
         # 1. 自动检测文件编码
         detect = chardet.detect(file_content)
-        encoding = detect.get("encoding", "utf-8").lower()
+        encoding = detect.get("encoding") or "utf-8"
+        encoding = encoding.lower()
 
         # 2. 兼容常见中文编码
         compatible_encodings = ["utf-8", "gbk", "gb18030", "gb2312", "ascii", "latin-1"]