Update app.py

app.py

@@ -42,7 +42,7 @@ def audio_separation():
 
 @app.route('/download/<filename>', methods=['GET'])
 def download(filename):
-    return send_file("/tmp/" + filename, as_attachment=True)
+    return send_file(filename, as_attachment=True)
 
 if __name__ == '__main__':
     app.run(debug=False)