Regarding the tablet and pen settings of your S6, these topics might be of interest to you.
And as for exporting to video formats, for those you will need FFMPEG, there’s no way around it as far as I know. But since I’m not interested in it personally, I haven’t tested it extensively yet. You can possibly take the detour >> record on the tablet >> copy the images to the PC >> & compose video / render on the PC from the images created. It’s cumbersome, but unless you can install FFMPEG on the tablet that’s the only way it will work, I think.
@all: Who knows more about video making on Android? Am I right?