I found a bug with the embedded content box and just wanted to share what it was and what my solution was for it.
If you add a link to a .pdf for instance, the embedded content box will come up when you click on it. The issue is that the css for ’embed’ has the height set to ‘auto’ this causes it to only show the very top of the box and not the other 75% of it.
I added in the code:
height: 100% !important;
to the custom css and that fixes it 🙂