UNI-APP 在安卓手机上保存视频失败

日志
android：
> 17:37:09.265 下载进度90 at pages/index/index.vue:129
17:37:09.674 下载进度95 at pages/index/index.vue:129
17:37:10.171 下载进度100 at pages/index/index.vue:129
17:37:10.193 下载进度100 at pages/index/index.vue:129
17:37:10.295 下载333 at pages/index/index.vue:108
17:37:10.316 下载成功 at pages/index/index.vue:110
17:37:10.377 saveVideoToPhotosAlbum:fail at pages/index/index.vue:117

ios：
17:35:54.259 [LOG] : 下载进度95
17:35:54.280 [LOG] : 下载进度100
17:35:54.300 [LOG] : 下载333
17:35:54.321 [LOG] : 下载成功
17:35:54.346 [LOG] : save success

部分代码

console.log('下载222')
const downloadTask = uni.downloadFile({
url: this.result,
success: (res) => {
console.log('下载333')
if (res.statusCode === 200) {
console.log('下载成功');
uni.saveVideoToPhotosAlbum({
filePath: res.tempFilePath,
success: function() {
console.log('save success');
uni.showToast({
title: '保存成功！'
})
},
fail: (resp) => {
console.log(resp.errMsg);
uni.showToast({
title: resp.errMsg,
icon: 'none'
})
}
});
}
}
});