How to send ImageMessage ???

[jrcapicua]

I'm trying to send 2 messages — one text and one image — from the Popup component. I'm using a LangGraph agent exposed via langgraph-cli, with a runtime configured using a langGraphPlatformEndpoint that correctly points to the exposed agent.
If I only send text messages, everything works correctly, but when I try to append multiple messages — say, one text and one image — the message content for the image appears to be empty.
What is the correct way to implement image sending using CopilotKit (AG UI)?
Both the client (react/tanstackstart), the runtime (expressjs), and the agent (langgraph-cli) are developed with TypeScript.

Is this possible or already implemented? I see that all the demos only involve sending text messages.

[NiuBlibing]

Multimodal messages are very important for AI Agents.