FileExtend

{
    "metaId": "string",
    "bucket": "string",
    "appSource": 0,
    "bizSource": 0,
    "format": "string",
    "image": {
        "width": "string",
        "height": "string",
        "orient": 0
    },
    "audio": {
        "duration": "string"
    }
}