Thanks for the useful information.

Among the various Apps, the one I prefer is Recorder Screen Pro, although I did not understand much of its commands.
https://play.google.com/store/apps/details?id=com.recorder.screen.pro
However, it seems to work very well.
I tried to create a video on my personal setting
https://www.youtube.com/watch?v=YlAMANFNu48