thumbnail image saved but blank in parse

i am trying to make and save a thumbnail image from the videos i record off the self destruct app here is my code that Im using:

• (void)uploadMessage { NSData *vidImageFileData; NSString *vidImageFileName; NSData *fileData; NSString *fileName; NSString *fileType;

  // check if its a image or video if (self.image != nil) { // if image shrink it UIImage *resizedImage = [self resizeImage:self.image toWidth:320.0 andHeight:480.0]; fileData = UIImagePNGRepresentation(resizedImage); fileName = @"image.png"; fileType = @"image"; } else { fileData = [NSData dataWithContentsOfFile:self.videoFilePath]; fileName = @"video.mov"; fileType = @"video";

  //UIImage *thumbnail = [self thumbnailFromVideoAtURL:self.moviePlayer.contentURL];
  

  // UIImage *thumbnail = [self currentItemScreenShot:self.moviePlayer.contentURL]; // self.thumbnailResized = [self resizeImage:thumbnail toWidth:75.0 andHeight:75.0]; vidImageFileData = UIImagePNGRepresentation(self.thumbnailResized); vidImageFileName = @"image.png"; }

  // upload the file itself PFFile *file = [PFFile fileWithName:fileName data:fileData]; [file saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) { if (error) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert Alert" message:@"file cannot be saved" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

      [alert show];
  } else
  {
      // upload message details
      PFObject *message = [PFObject objectWithClassName:@"Message"];
      [message setObject:file forKey:@"file"];
      [message setObject:fileType forKey:@"fileType"];
      [message setObject:self.recipients forKey:@"recipientsIds"];
      [message setObject:[[PFUser currentUser] objectId] forKey:@"sendersIds"];
      [message setObject:[[PFUser currentUser] username] forKey:@"sendersName"];
      message[@"thumbnail"] = [PFFile fileWithName:vidImageFileName data:vidImageFileData];
      [message saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
          if (error)
          {
              UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert Alert"
                                                              message:@"file cannot be saved"
                                                             delegate:self
                                                    cancelButtonTitle:@"OK"
                                                    otherButtonTitles:nil];
  
              [alert show];
          } else
          {
              // went well
              [self reset];
  
          }
      }];
  }
  

  }];

}

now it is saving but when i go into parse and click on the image.png of the thumbnail it is blank what is it im doing wrong