• bytes Buffer - 已发送内容
• file String - 已上传文件的路径
• blobUUID String - blob格式的UUID数据. 使用 ses.getBlobData 方法获取该数据

UploadData Object

• bytes Buffer - Content being sent.
• file String - Path of file being uploaded.
• blobUUID String - UUID of blob data. Use ses.getBlobData method
  to retrieve the data.