Hmm... 🤔 Posted the shortener thing above because someone had messaged me asking about it, and in their example the shortener didn't work while the full length address did work.
I wonder if there are two different things happening at once here, as it doesn't seem as clearcut as it appeared at first?
@stokes @MagentaRocks
I just tried the example you gave (https://www.youtube.com/watch?v=5IKgpxLN86M) and that worked fine now.
So, it seems to be an intermittent thing in some cases at least?
(I'm assuming here that you can see the preview below, it's possible that your server won't render it as each server renders its own previews.)