Update app.py

app.py

@@ -113,6 +113,7 @@ snapshot_download(
     local_dir_use_symlinks=False,
 )
 persist_dir = str(LOCAL_BASE / PERSIST_SUBDIR)
+storage_context = StorageContext.from_defaults(persist_dir=str(persist_dir))
 index = load_index_from_storage(storage_context, embed_model=emb)
 
 # Datasets & GPU build code remains commented out...