Youtube videos require the full URL

[cathgillespie]

Unlike Soundcloud or Vimeo, when embedding Youtube videos you must use the address from the browser address bar, and not the share>copy link.

The Youtube video will neither preview in the dashboard nor display locally on the site - only on the server.

Neither the browser address nor the share>copy link address display video from vevo.com

Because of the popularity of Youtube (and because it's specifically mentioned in the documentation), I think it would be useful to mention these issues in the documentation