/**
* In case of large files, use the multipartUpload method, so the file is sent in chunks to S3, without the need
* to read the complete file in memory.
*
* @param $bucket
* @param $key
* @param $sourcePath
* @param int $concurrency
*
* @return mixed
*/
public function multipartUpload($bucket, $key, $sourcePath, $concurrency = 1)
{
return $this->instance->multipartUpload($bucket, $key, $sourcePath, $concurrency);
}