How can you record screen in android version litchi?
Using a 3rd party screen recorder app. For example: XRecorder
Thanks - but is the app free or does it cost?
It’s free, download it and try
Another option is AZRecorder. Free and works great; I use it almost every time I attempt to fly with dronedeploy to document how badly DD doesn’t work! 
Unfortunately it seems not compatible with Smart controller (so says the app)
For smart controller (and most android/iOS devices these days), you can use the built-in screen recorder. Swipe down from top of the screen and you should see a record screen button in the system menu
Thanks, I’ll do just that