public function upload($sourceFile, $destinationFile)
    {
        Service::$log->msg('Upload to S3 started: ' . $sourceFile);
        $destinationFile = rtrim($this->s3Config->RemotePath, '/') . '/' . $destinationFile;
        $this->s3Instance->multipartUpload($this->s3Config->Bucket, $destinationFile, $sourceFile, 3);
        Service::$log->msg('Upload ended');

        return $destinationFile;
    }