Output markdown with image

I’m testing image rendering in a GPT Apps / MCP flow.

Issue: an image hosted on DigitalOcean Spaces does not render when the markdown is returned directly from an MCP tool result.

Example image URL:

https://bustet-name.server.digitaloceanspaces.com/2026/05/nameFile.jpg

The URL is public and valid:

• HTTP status: 200

• Content-Type: image/jpeg

• File size: about 104 KB

The MCP tool returns markdown like this:

![Image](htps://busket-name.server.digitaloceanspaces.com/2026/05/nameFile.jpg)

Expected behavior: the GPT Apps response should render the markdown image preview.

Actual behavior: when this markdown comes from the MCP tool response, the image is not displayed.

Important detail: if I ask ChatGPT directly to output the exact same markdown, using the same formatting instructions as in the tool description, the image renders correctly. So the problem seems specific to markdown/image rendering from MCP tool output in GPT Apps, not the URL itself.

Question: is there a known limitation or required format for rendering external markdown images returned from MCP tools in GPT Apps?