The background of my question is as follows: I found a Vimeo embedded video on some website, and I would like to play it on the big screen (using my Apple TV with the Vimeo tvOS app installed, in which I successfully logged in to my Vimeo account; I suppose other kinds of set-top boxes or tablets with a Vimeo app would work just as well).
When visiting that website from a computer, however, I cannot find a Watch Later button (presumably because the video owner disabled it) — Regardless of whether I am logged in while browsing the website, and/or I open the iframe the video is in into a different tab. Is there still a way to exercise the Watch Later feature on such unlisted videos?