您的观察是正确的，目前，EmailComposeTask不支持附件，这是目前唯一从设备以编程方式发送电子邮件的工具。

Your observation is correct, at this point in time EmailComposeTask doesn't support attachments and this is the only facility to send email programatically from the device at the moment.

请注意，您可以与可以代表您的应用程序执行此任务的服务器进行通信。

As you note, you can communicate with a server which can perform this task on behalf of your app.