[youzan/vant-weapp][Bug Report] IOS端上传视频无法预览

http://114.117.163.254/%E4%B8%8A%E4%BC%A0%E8%A7%86%E9%A2%91.gif

### Tasks
- [ ] Add a draft title or issue reference here

<van-cell-group>
    <van-cell title="视频上传" value="{{videoList.length}}/1" use-label-slot> 
    <view slot="label" style="margin-top:10px">
        <van-uploader file-list="{{ videoList }}" bind:after-read="afterReadVideo" bind:delete="onDeleteVideo" accept="video" max-count="1" max-duration="60" />
    </view>
    </van-cell>
</van-cell-group>

1.7.2、官方微信小程序示例

ios端，Uploader上传视频后，点击无法预览，安卓端正常

IOS端 1.选择或拍摄视频。 2.点击预览。

IOS