Updated app.py

app.py

@@ -460,7 +460,7 @@ def upload_to_gemini(path, mime_type=None):
 
 def response(message, history):
     message_text = message["text"]
-    message_files = message["file"]
+    message_files = message["files"]
     if message_files and isinstance(message_files, list):
         image_uris = [upload_to_gemini(file_path) for file_path in message_files]
         message_content = [{"text": message_text}] + image_uris