Update main.py

main.py

@@ -496,7 +496,7 @@ def download_receipt(transaction_id):
             io.BytesIO(r.content),
             mimetype='image/jpeg',
             as_attachment=True,
-            download_name='receipt.jpg'
+            attachment_file='receipt.jpg'
         )
     except Exception as e:
         print(f"Download receipt error: {str(e)}")