真机和开发环境，都能保存，真机调试也提示了保存到手机的具体位置；生产环境和体验版无法保存到相册，也没有提示保存到哪里。

wx.saveVideoToPhotosAlbum({
                                                filePath: rest.tempFilePath,
                                                success(res) {
                                                    console.log(res.errMsg)
                                                },
                                                fail(res) {
                                                    console.log(res)
                                                }
                                            })