Monitoring Video posts

Monitoring a site with several pages. Video A is posted at two of the pages, Video B plays from one of those at a link further down the page. Getting error trying to monitor source site.
Since the videos could be replaced by the source video being replaced (w/o the site text changing), is there any way to use Distill to track whether that happens?

What “Bell” is referred to in this post-acknowledgment?

Do you need to monitor changes to the page’s source? If yes, checkout the following article that shows how to do that by changing the monitored field. For example, you can monitor src or outerHTML.

Let me know if that makes sense of doesn’t.

That is Discourse’s feature to notify users of replies to specific posts. It is usually enabled for post’s author but can optionally be switched off.