Issue Summary

An embedded WebP video plays while in Preview mode, but after publishing the page, the video displays an error message: "Preview unavailable."

In testing, the issue does not occur with static WebP images.

Steps to Reproduce

1. Insert a WebP video into a Confluence Cloud page.
2. Preview the page to confirm the video plays correctly.
3. Publish the page.

Expected Results

The WebP video should play correctly after the page is published.

Actual Results

The WebP video previews in Edit mode.

The WebP video shows an error message: "Preview unavailable" after publishing the page.

Watch a video of the behavior here: preview-issue.mp4

Workaround

Use a different video format, such as MP4.