Twilio MMS状态始终保持在使用Bot框架发送时发送

Question

我正在为Twilio（SMS）频道构建一个机器人。当我向美国的某个号码发送简单的普通短信时，它会在twilio消息日志中以Delivered的形式发送。

但是当我将任何图像附加到邮件上以发送彩信时，邮件永远不会被传递，并且它在twilio日志中的状态始终为sent。

以下是我将媒体附加到彩信的方式。

var msg = new builder.Message(session);
msg.attachmentLayout(builder.AttachmentLayout.list)
msg.attachments([
    new builder.HeroCard(session)
        .title("This is Title")
        .subtitle("This is sub title")
        .text("This is text")
        .images([builder.CardImage.create(session, 'http://www.readersdigest.ca/wp-content/uploads/2011/01/4-ways-cheer-up-depressed-cat.jpg')])
]);

session.send(msg).endDialog();

我还使用另一种方式构建消息：

var msg = new builder.Message(session)
    .text("This is a title - which can be long and multiple line sometimes<br/><br/>The body of the text can be really really long sometimes with different formats with links <http://google.com|Google><br/><br/>some times with a footer with `formats`")
    .addAttachment({
        contentUrl: 'http://www.readersdigest.ca/wp-content/uploads/2011/01/4-ways-cheer-up-depressed-cat.jpg',
        contentType: 'image/png',
        name: 'BotFrameworkOverview.png'
    });

这两条消息永远不会被传递。

但是没有媒体的简单消息成功传递为 -

var msg = new builder.Message(session)
   .text("This is a title - which can be long and multiple line sometimes<br/><br/>The body of the text can be really really long sometimes with different formats with links <http://google.com|Google><br/><br/>some times with a footer with `formats`")

Twilio Log：