docs: function () {
      cachedClient.completeMultipartUpload({
        Bucket: multipartUploadResult.Bucket,
        Key: multipartUploadResult.Key,
        UploadId: multipartUploadID,
        CompleteMultipartUpload: {
          Parts: partIds
        }
      }, function (err, result) {
        if (err) return abortUpload(err);
        ws.emit('uploaded', result);
      });
    }