testIsFileTypeUnknown = async function(upload, fileType, fileExtension, logObject, res){
  if(fileType == 'unknown'){
    upload.status = 'rejected';

    await upload.save();

    logObject.uploadExtension = fileExtension;
    uploadLogger.info('Unknown file type', logObject);

    res.status(500);
    res.send({message: 'UNKNOWN-FILETYPE'});
    return true;
  }

  return false;

}
RESPOND EARLY IF ITS AN UNKNOWN FILE TYPE *