still can't screen record on android - what am i missing?

Android 11 is where the built-in recorder arrived, so on anything older there just isn't one - you'd need an app from the play store. Quickest check is Settings, About phone, Android version.

Pull the quick settings panel all the way down and look for Screen record. On plenty of phones it isn't on the visible page at all - tap the pencil or edit button and drag it in from the hidden tiles, and that's usually the entire problem. One thing to expect before you bother: internal audio is up to the app. Anything with copy protection records as a black rectangle no matter what you do. Samsung keeps its own recorder in a slightly different spot in the panel, same idea though.