async function addLastTimeWatched(upload, user){
  let lastWatchedTime;
  if(upload.durationInSeconds >= 900){
    lastWatchedTime = await LastWatchedTime.findOne({
      user : user._id,
      upload: upload._id
    });
  }
  // Check if user watched the video
  if(lastWatchedTime !== undefined && lastWatchedTime !== null){
    return lastWatchedTime.secondsWatched;
  }
}
if the file has been deleted then it won't blow up *