Update main.py

main.py

@@ -9,6 +9,8 @@ import PyPDF2
 from langchain_openai import ChatOpenAI
 from langchain.schema import HumanMessage
 import json
+from fastapi.responses import FileResponse
+
 UPLOAD_FOLDER = "uploads"
 os.makedirs(UPLOAD_FOLDER, exist_ok=True)