code: public File getFile(String fileId) {
          URI url = Urls.apiFile(fileId);
          RequestHelper requestHelper = getRequestHelper();
          FileData fileData = requestHelper.executeQuery(new HttpGet(url), true, FileData.class);
          return new File(this, fileData);
      }
docs: Requests file data.
  
  @param fileId Resource UUID
  @return File resource