• type String - blob.
• filePath String - 准备上传的文件的路径
• offset Integer - 默认值 0.
• length Integer - 从 offset中读取的字节数. 默认值0.
• modificationTime Double - 最后更新时间，自UNIX时期计时总的秒数表示.

UploadFile Object

• type String - file.
• filePath String - Path of file to be uploaded.
• offset Integer - Defaults to 0.
• length Integer - Number of bytes to read from offset.
  Defaults to 0.
• modificationTime Double - Last Modification time in
  number of seconds since the UNIX epoch.