It's funny, I've never seen it work correctly, even in the simplest case, on any of my devices.
Usually, clicking on the video does nothing. If I wait for enough seconds, it might start, maybe without sound. Or it might start the sound without the image. If I try to skip to some moment that hasn't been loaded yet, it usually just blocks and stops doing anything.
Maybe you have the exact browser/device/screen size/OS combination that the devs test on. Note I don't use the mobile Reddit app, only the website.
I'd like the devs to please just use the browser's <video> reader, without adding their own JS.
