Using nodejs for WeChat development
Uploaded temporary materials
The reply mechanism to the video is as follows:

if(content === '视频'){
        var data = yield wechatApi.uploadMaterial('video',__dirname+'\public\video\3.mp4')
        console.log('data')
        console.log(data)
        reply = {
            type:'video',
            title:'回复的视频',
            description:'视频描述',
            mediaId:data.media_id
        }
    }

After entering "video" in the mobile WeChat client,
the background display is as follows:

If such a code appears, it should mean that the upload was successful, right? However, the message displayed on the mobile phone is that the official account is temporarily unavailable. Please try again later? why is that?
ps: I also found that when uploading, it was uploaded three times? I only posted one "video", how come it was uploaded three times?
The uploaded code is as follows:

Wechat.prototype.uploadMaterial = function(type,filepath){
var that = this;
var form = {
    media: fs.createReadStream(filepath)
}
return new Promise(function(resolve,reject){
    that
    .fetchAccessToken()
    .then(function(data){
        console.log(data);
        var url = api.upload +'access_token='+data.access_token + '&type='+type;
    request({method:'POST',url:url,formData:form,json:true}).then(function(response){
        var _data = response.body;
        //console.log(data);
        if(_data){
            resolve(_data)
        }
        else{
            throw new Error('upload Material fail')
        }
    })
    .catch(function(err){
        reject(err)
    })
    })
})    
}

As for the upload interface, it is like this:
var wechatApi = new Wechat(config.wechat)
This is the instantiation of the above, and the data required for the specific instantiation is obtained from the config.
When uploading, use the wechatApi.uploadMaterial() method to achieve this.