问腾讯即时通信IM，为何创建视频消息无法唤起视频界面？

<div class="btn">
    <span>开始视频</span>
    <input type="file" id="videoPicker" class="file-picker" accept=".mp4"/>
</div>
<style>
    .btn{position:relative;padding:5px 10px;cursor:pointer;overflow:hidden;}
    .file-picker{opacity:0;font-size:100px;position:top:0;left:0;}
</style>
<script>
    $(document).on("change","#videoPicker",function(e){
        var message = _.tim.createVideoMessage({
        to: "user"+_.curUserId,
        conversationType: TIM.TYPES.CONV_C2C,
        payload: { file: e.target },
        onProgress: function(event) { console.log('file uploading:', event) }
    });
    var promise = _.tim.sendMessage(message);
        promise.then(function(imResponse) {
            // 发送成功
            console.log(imResponse);
        }).catch(function(imError) {
            // 发送失败
            console.warn('sendMessage error:', imError);
        });
    });
</script>