void HandleUploadReqFinish(bool _success, string _photoUrl)
 {
     if (_success)
     {
         if (_photoUrl != null)
         {
             // Generate QR Code
             qrCodeGenerator.GenerateQRCode(_photoUrl);
         }
         else
         {
             Debug.LogError("photoURL == null");
         }
     }
     else
     {
         isGameReady = false;
         // Show Error Canvas
         uiController.ActivateCanvasNetworkError(true);
     }
 }