diff --git a/backend/app/services/llm_service.py b/backend/app/services/llm_service.py
index 1f8429f..1794650 100644
--- a/backend/app/services/llm_service.py
+++ b/backend/app/services/llm_service.py
@@ -1,7 +1,7 @@
 import json
 import dashscope
 from http import HTTPStatus
-from typing import Optional, Dict, List, Generator
+from typing import Optional, Dict, List, Generator, Any
 import app.core.config as config_module
 from app.core.database import get_db_connection
 from app.services.system_config_service import SystemConfigService
diff --git a/frontend/nginx.conf b/frontend/nginx.conf
index acd9a68..5abc93e 100644
--- a/frontend/nginx.conf
+++ b/frontend/nginx.conf
@@ -13,7 +13,7 @@ server {
     gzip_disable "MSIE [1-6]\.";
 
     # 增加上传文件大小限制
-    client_max_body_size 200M;
+    client_max_body_size 500M;
 
     location / {
         try_files $uri $uri/ /index.html;