That’s what I typically do (you can see I did it in the above clip).
That never worked for me. I rarely use the preview window and still had problems. Granted, that may have changed since I first learned of the workaround I use (pasting the link and quickly hitting submit), but this way still works. I’ll try just using the non-preview method as my way is a PITA if I want to embed more than one video.
No preview, leaving this up for a few seconds while I type this sentence.