问云点播, web端sdk上传, 接口返回 ugc upload | invalid request？

<script src="${base}/assets/plugins/jQuery/axios/axios.min.js"></script>
<script src="${base}/assets/plugins/jQuery/tenxun/vod-js-sdk-v6.js"></script>

<script>
    //定义获取上传签名的函数
        function getSignature() {
            return axios.post('${base}/a/pubVideos/txSignature').then(function (response) {
                return response.data;
            })
        };
        //腾讯云上传
        $(".wt-add").click(function () {
            if(!$("#frameForm").valid())
                return false;
            var fromdata = getFromObj();
            // console.log(getSignature)
            WT.wt_confirm('是否发送?', function () {
                var file = document.querySelector('input[type=file]').files[0];
                console.log(file)
                $("#uploadLoading").show();
                const tcVod = new TcVod.default({
                    getSignature: getSignature // 前文中所述的获取上传签名的函数
                })
                const uploader = tcVod.upload({
                    mediaFile: file, // 媒体文件（视频或音频或图片），类型为 File
                })
                uploader.on('media_progress', function(info) {
                    console.log(info.percent) // 进度
                    loadPlan("loading",rinfo.percent);
                })
                // 回调
                uploader.done().then(function (result) {
                    console.log(result)
                    fromdata.append('yx_course_id', result.fileId);
                    fromdata.append('course_url', result.video.url);
                    console.log(fromdata);
                    //保存
                    WT.wt_ajax_fileData('${base}/a/courseSeries/courseSeriesDetail_add',fromdata,function(data){
                        WT.wt_alert('发送成功');
                        WT.wt_reload_jqtable(this);
                    });
                }).catch(function (err) {
                    // deal with error
                    console.log(err) // Error: ugc upload | invalid request
                })
            });
        });
</script>