https://ext.dcloud.net.cn/pluginid=4079
1、第一步必须导入uniapp的云服务空间，不然会报错
uniCloud.chooseAndUploadFile is not function
2、
<uni-file-picker :value=“videoValue” @success=“successVideo”
@fail=“failVideo” limit=“1” file-mediatype=“video” mode=“grid” />
// 上传成功，获取服务空间文件地址e.tempFilePaths[0]
successVideo(e) {
console.log(e.tempFilePaths[0]);
this.videoUrl = e.tempFilePaths[0];
},
