问为什么IM上传图片没有返回大小信息？

{
    "ID": "GROUP@IM_G_35-3-2939008-0",
    "conversationID": "GROUP@IM_G_35",
    "conversationType": "GROUP",
    "time": 1583208302,
    "sequence": 3,
    "clientSequence": 52059,
    "random": 2939008,
    "priority": "Normal",
    "_elements": [{
        "_imageMemoryURL": "",
        "type": "TIMImageElem",
        "_percent": 0,
        "content": {
            "imageFormat": 255,
            "uuid": "1400305955-@IM_U_25-rPx492DkR6DSuMLQQU6c6KZEgf5N9Hdt",
            "imageInfoArray": [{
                "instanceID": 9649905,
                "sizeType": 3,
                "size": 1571658,
                "width": 0,
                "height": 0,
                "imageUrl": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG",
                "url": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG"
            }, {
                "instanceID": 9854237,
                "sizeType": 2,
                "size": 0,
                "width": 0,
                "height": 0,
                "imageUrl": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG",
                "url": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG"
            }, {
                "instanceID": 9909198,
                "sizeType": 1,
                "size": 1571658,
                "width": 0,
                "height": 0,
                "imageUrl": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG",
                "url": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG"
            }]
        },
        "_defaultImage": "http://imgcache.qq.com/open/qcloud/video/act/webim-images/default.jpg"
    }],
    "isPlaceMessage": 0,
    "isRevoked": false,
    "geo": {},
    "from": "@IM_U_25",
    "to": "@IM_G_35",
    "flow": "in",
    "isSystemMessage": false,
    "protocol": "JSON",
    "isResend": false,
    "isRead": false,
    "status": "success",
    "nick": "13153009217",
    "avatar": "",
    "nameCard": "",
    "payload": {
        "imageFormat": 255,
        "uuid": "1400305955-@IM_U_25-rPx492DkR6DSuMLQQU6c6KZEgf5N9Hdt",
        "imageInfoArray": [{
            "instanceID": 9649905,
            "sizeType": 3,
            "size": 1571658,
            "width": 0,
            "height": 0,
            "imageUrl": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG",
            "url": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG"
        }, {
            "instanceID": 9854237,
            "sizeType": 2,
            "size": 0,
            "width": 0,
            "height": 0,
            "imageUrl": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG",
            "url": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG"
        }, {
            "instanceID": 9909198,
            "sizeType": 1,
            "size": 1571658,
            "width": 0,
            "height": 0,
            "imageUrl": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG",
            "url": "https://cos.ap-shanghai.myqcloud.com/606f-shanghai-007-shared-02-1256635546/7f07-1400305955/9b11-%40IM_U_25/%40IM_U_25-%40IM_G_35-88981-1583208289008.PNG"
        }]
    },
    "type": "TIMImageElem"
}