Disable unstable hf_transfer downloads

app.py

@@ -3,6 +3,12 @@ import io
 import json
 import numpy
 import os
+
+# The accelerated transfer backend occasionally leaves Spaces trying to use an
+# expired signed URL while downloading model weights. Disable it before any
+# Hugging Face libraries are imported so downloads use the standard HTTP path.
+os.environ["HF_HUB_ENABLE_HF_TRANSFER"] = "0"
+
 import pandas as pd
 import piexif
 import spaces