Update app.py

app.py

@@ -284,8 +284,8 @@ def upload_file():
             
             f1 = calculate_and_display_angles(file)
             return send_file(
-                BytesIO(f1.read()), mimetype=mime_type,
-                as_attachment=False, download_name=f1.filename
+                BytesIO(file.read()), mimetype=mime_type,
+                as_attachment=False, download_name=file.filename
             )
             # return send_file(
             #     BytesIO(file.read()), mimetype=mime_type,