Saving FileTransfer response to a scope

Am Using the cordova file transfer plugin in my ionic app as shown here on the Github page. The plugin works fine and i get a json response as shown in this screenshot. However, i do not need the whole response. i ONLY want to save “url”:“XXXXXXX” into a scope. I have tried using an expression like $scope.Uploaded_url = r.response.url; but it remains blank.Someone please Bail me out.Thank You in advance