code: public function convertValueToPath($varValue, $fallback)
      {
          if (Validator::isUuid($varValue)) {
              $model = $this->filesAdapter->findByPk($varValue);
              if ($model !== null && file_exists($this->rootPath . '/' . $model->path)) {
                  return $model->path;
              }
              return $fallback;
          }
          if (file_exists($varValue)) {
              return $varValue;
          }
  
          return $fallback;
      }
docs: Translate the file ID to file path.
  
  @param string $varValue The file id.
  @param string $fallback The fallback file path.
  
  @return string