我使用C#代码尝试了相同的操作，并得出了相同的结论:在Skype Channel上，我们为此出现了Unknown attachment type异常. 在模拟器和Slack上工作(获得了下载wav文件的链接)

I tried the same with C# code and got the same conclusion: on Skype Channel, we got an Unknown attachment type exception for this. Working on emulator and Slack (got a link to download the wav file)

必须有一个频道限制，或者是一个错误.

There must be a channel limitation yes, or a bug.

无论如何，您都可以尝试使用AudioCard:我已经在C#代码中对其进行了测试，并且可以在Skype上运行:

Anyway you may try to use AudioCard: I tested it (in C# code) and it's working on Skype:

此处的示例代码: https://github.com/Microsoft/BotBuilder-Samples/tree/master/CSharp/cards-RichCards