I use the "old version" of the torch browser to grab videos, torchbrowser.com If you find it DON'T UPDATE IT! The old version can copy youtube. Sometime I look at the page source, view-source: before https:// like this view-source:https:// or right click the page edge, then search for .mp4 or whatever, embeds etc. after a while you get good at finding most media, but not always.