code: public function __batchProcessFilesChunk($filesUuidArr, $request_type)
      {
          if (count($filesUuidArr) > $this->batchFilesChunkSize) {
              throw new \Exception('Files number should not exceed '.$this->batchFilesChunkSize.' items per request.');
          }
          $data = $this->__preparedRequest('files_storage', $request_type, array(), $filesUuidArr);
          $files_raw = (array)$data->result;
          $result = array();
          foreach ($files_raw as $file_raw) {
              $result[] = new File($file_raw->uuid, $this, $file_raw);
          }
          return array(
              'status' => (string)$data->status,
              'files' => $result,
              'problems' => $data->problems,
          );
      }
docs: Run request to process multiple files
  
  @param array $filesUuidArr uploaded file's uuid array you need to process.
  @param string $request_type request type, could be PUT or DELETE .
  @return array with processed files and problems if any
  @throws \Exception