Codex Desktop Markdown preview renders a public GitHub image as a link instead of displaying it inline

What version of the Codex App are you using (From “About Codex” dialog)?

26.715.31925

What subscription do you have?

ChatGPT Plus

What platform is your computer?

Darwin 25.3.0 arm64 arm
macOS 26.3 (Build 25D125)

What issue are you seeing?

The Codex Desktop Markdown preview does not render an external HTTPS image referenced with standard Markdown image syntax. Instead, it displays the image alt text and URL as a clickable link.

The same Markdown file renders the image correctly in VS Code. The same image URL also opens and displays correctly in the Codex in-app browser.

The public test image returns a successful response:

HTTP status: 200
Content-Type: image/png
Final URL: https://raw.githubusercontent.com/qufei1993/skills-hub/main/docs/assets/my-skills-card-view.png

What steps can reproduce the bug?

1. Create a Markdown file containing:

# Codex Markdown external image rendering test

The following public HTTPS image loads normally when opened directly in a browser.

![My Skills card view](https://github.com/qufei1993/skills-hub/raw/main/docs/assets/my-skills-card-view.png)

1. Open the Markdown file in Codex Desktop.
2. View it using the built-in Markdown preview.
3. Observe that the image is represented as alt text and a clickable link instead of being rendered inline.
4. Open the same image URL in the Codex in-app browser and observe that the image displays correctly.

This reproduces consistently.

What is the expected behavior?

Codex Desktop should render external HTTPS images inline in the Markdown preview when they use valid standard Markdown image syntax, consistent with VS Code and other Markdown previewers.

Additional information

The reproduction uses a publicly accessible GitHub image that requires no authentication.

Possibly related issues:

• #23878
• #31678
• #32693