This has happened to me before and it was a coding error that the person on the phone helped me fix really easily. I just wish I could remember what he changed. Can any of you help?
Thank you for reaching out to the Community! The easy fix with this issue is to delete the video block that was inserted and put back a new one. That should allow you to paste the link back and for the thumbnail image to show.
I apologize your video is still not working! Can you try a different link to this video please?