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,
        );
    }