How to insert a link to Youtube video, with preview image shown

That’s certainly possible, I can’t say when exactly I learned the workaround of closing the preview pane, but I remember the discussion in the “Site Feedback” thread where your method of quickly posting after inserting the link came up some time before someone proposed the other method. I can’t remember when that was (at least half a year ago, I estimate), and if that info was new when I read that thread.

For reference, here’s the thread: