public function downloadFile($fileId)
    {
        $file = $this->getFile($fileId);
        $options = [
            CURLOPT_HEADER => 0,
            CURLOPT_HTTPGET => 1,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_URL => $this->getFileUrl().'/'.$file->getFilePath(),
        ];

        return $this->executeCurl($options);
    }