Is it possible to access UNNotificationAttachment's URL from the UNUserNotificationCenterDelegate's method -userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler: method?

My app posts a local notification to the UNNotificationCenter & I attach an image with the notification. If I press the notification in the notifcation center to launch my app, my UNUserNotificationCenterDelegate gets hit with -userNotificationCenter:userNotificationCenter:withCompletionHandler:


If I dig for the attachment I provided the notification, I do get an URL, but I can't access the resource.


- (void)userNotificationCenter:(UNUserNotificationCenter*)center
didReceiveNotificationResponse:(UNNotificationResponse*)response
         withCompletionHandler:(void(^)(void))completionHandler
{

      UNNotificationRequest *request = response.notification.request;
      UNNotificationContent *content = request.content;

       for (UNNotificationAttachment *aAttachment in content.attachments)
       {
          NSURL *fileURL = aAttachment.URL;

         //If I attempt to do anything with the URL fails. I do get a URL (not nil) but I cannot access it. 
       }


    //....
    completionHandler();
}

.

Is an app not able to do anything with a notification's attached resources?