最新版的微信，拿到tempFilepath了，但是saveVideoToPhotosAlbum的时候返回，invalid video。之前版本是正常�?

var mp4url = "https://example.com/xxx.mp4";

wx.downloadFile({

    url: mp4url, //仅为示例，并非真实的资源

    success: function (res) {   

        // 只要服务器有响应数据，就会把响应内容写入文件并进�? success 回调，业务需要自行判断是否下载到了想要的内容

        if (res.statusCode === 200) {

             console.log(res.tempFilePath);

                wx.saveVideoToPhotosAlbum({

                        filePath: res.tempFilePath

                        success(res) {

                },

                fail(res) {

                              console.log('1111111111111111111111111122');

                              console.log(res);

                }

        })

    }

},