Csharp Twilio 对话 发送图像

目标是使用对话API(群聊)从后端发送图像.

我明白了，如果只是1对1的消息，你怎么能做到use mediaUrl:

MessageResource.Create(
        body: "Hello there!",
        from: new Twilio.Types.PhoneNumber("+15555555555"),
        mediaUrl: mediaUrl,
        to: new Twilio.Types.PhoneNumber("+12316851234")
);

以上不适用于我，因为我希望使用群聊将多个成员.以下是我当前用于向多个参与者发送文本的实现

// create a group chat
ConversationResource conversation = ConversationResource.Create(client: _twilioClient);

var bootyService = ParticipantResource.Create(
    identity: "myService",
    messagingBindingProjectedAddress: "+15555555555",
    pathConversationSid: conversation.Sid, 
    client: _twilioClient
);

// participant 1
var sender = ParticipantResource.Create(
    messagingBindingAddress: "+12316851234",
    pathConversationSid: conversation.Sid, 
    client: _twilioClient
);

// participant 2
var Receiver = ParticipantResource.Create(
    messagingBindingAddress: "+12316851234",
    pathConversationSid: conversation.Sid, 
    client: _twilioClient
);

var groupMessage = ConversationMessageResource.Create(
    body: "Hi this is a group chat",
    author: "myService",
    pathConversationSid: conversation.Sid, 
    client: _twilioClient
);

Conversations API没有任何MediaURL的概念.可以使用对话消息资源发送图像吗？