So when I use the console (F12) and toggle to mobile view in Chrome, it initially does show the video at the bottom. Then on refreshing while in mobile view, the video disappears.

I confirmed that on my phone as well, the video cannot be seen. But on switching to desktop mode on the phone, the video can be seen.

That makes me suspect this is a responsive issue. Did you check in the responsive editor? Perhaps some other group is covering it? Are you using a mobile page and a desktop page, or is it a single page that is responsive?