On a limited connection, I’d advise not updating whilst watching a video. It’s also possible to download a video and watch it whilst updating.
Beyond that it’s not easy to answer - as I don’t use discover, but also never do updates without paying attention, so that watching a video at the same time isn’t something I’d contemplate.
First step to log in is to paste some URL - and https://lemmy.world/ doesn’t work for that… another hurdle to exclude anyone not advanced enough?