Feature: audio/video download with yt-dlp

[asciimoo]

It would be great to utilize the yt-dlp tool to download custom multimedia from sites like youtube when snapshotting. However it raises multiple questions that should be discussed before the implementation.
Some of the questions:

• Should we download the videos automatically if yt-dlp can extract video from a snapshotted url or should we ask the user?
• What would be the preferred format? (best/worst quality/custom each time?)
• Can we somehow embed the downloaded video back to the original snapshot or only reference the video from the snapshot preview page?
• Should we make a custom multimedia view, where all the audio/video streams are accessable?

Currently I'd say the best way to implement it is an optional download button in the snapshot preview page where then we can ask the user to select a preferred format. We can then replace the download button with a "view multimedia" button in case there is multimedia content already available for a snapshot.
Please add your ideas/feature requests/use cases below.