from threading import Thread

app.py

@@ -7,6 +7,7 @@ import spaces
 import tempfile
 import requests
 from PyPDF2 import PdfReader
+from threading import Thread
 
 # Check if we're running in a Hugging Face Space and if SPACES_ZERO_GPU is enabled
 IS_SPACES_ZERO = os.environ.get("SPACES_ZERO_GPU", "0") == "1"