You can use this:
https://xenforo.com/community/resources/cxf-thread-information-blocks.9213/
And stick (float) it with this:
https://xenforo.com/community/resources/cxf-sticky-sidebar.6675/
@BassMan
I went the second route and it all worked out. The only thing I noticed missing was the arrow icon in a quote that brings you to that post. IP.Board 3 had this but XF 1.5 did not, so the quote boxes have no link.
I was also locked out of posting. They invalidate your account if your transactional emails bounce and I guess they had an outbound issue. Didn't change my email but the notice still wanted me to confirm. Clicked to confirm a few times and never got it, finally did. Hopefully they have resolved it.
The field does embed. That's not the issue. I'll await XF's reply to the issue.
Use case: Field description states to enter a YT URL. User does and when posting it embeds. Issue is URL Value Match does not work and allows them to add text that should not be there. Thanks!