Greyed out because there is no video location for you to view or save. It’s playing a stream, put together from many pieces, so that it performs and functions b

Greyed out because there is no video location for you to view or save. It’s playing a stream, put together from many pieces, so that it performs and functions better. Switching between sources mid-play is a lot harder than most realise, because random seek is expensive in videos. So instead you tend to treat it as a large number of files of a few seconds each that get glued together as you play it, and you can switch between them as you go. The web platform could be extended to cover multiple-bitrate streaming and let the browser take control, but that’s a pretty complex affair, and I suspect that it still wouldn’t be enough to make these operations work—the browser would need a way of putting it back together again into one file.