public function saveFile($file_name) {
    $path = 'public://govcms8-demo';
    if (file_prepare_directory($path, FILE_CREATE_DIRECTORY)) {
      $source = DRUPAL_ROOT . '/' . drupal_get_path('module', 'govcms8_default_content') . '/import/images/' . $file_name;
      $data = file_get_contents($source);
      return file_save_data($data, "public://govcms8-demo/" . $file_name, FILE_EXISTS_RENAME);
    }
  }