I want to embed a screen recording taken with loom inside a Confluence page.
The advice for embedding videos in pages is to use a "Widget Connector" macro.
That macro requires a URL for the widget.
Each loom video has a public URL, like this
https://www.loom.com/share/5f42d456bf4e42b88d4649124a5dafc2
If I use this as the widget URL, then the page just shows a generic widget connection icon, and clicking it won't open the video.

Loom provides its own tools for embedding videos. For that video, it will generate this embedding code.
<iframe width="640" height="360" src="https://www.loom.com/embed/5f42d456bf4e42b88d4649124a5dafc2" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
My organization has HTML macros disabled, so I can't just insert this directly. I tried using the src attribute (https://www.loom.com/embed/5f42d456bf4e42b88d4649124a5dafc2) for the widget URL in the Widget Connector, but that had the same result as before.
How can I embed the recording?
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Update: loom support states that they are "working on bringing [the existing Jira integration] to Confluence.

Downloading the video from loom and uploading the resulting mp4 file works.