The problem isn't with your controller.
The problem is what you are doing with it.
You can't use another screen device with the RC controller, so there's no need to use any cables.
Try using it the way it's intended and it will work just fine...
NO android DJI apps are available on the google Play Store, you HAVE to download them directly from the DJI website:
https://www.dji.com/downloads?site=brandsite&from=nav
NO, not if you downloaded GO4 from the DJI website as linked above.
There's only 1 way:
Use the Date/Time stamp of the KMZ files on the controller.
-On your controller open the waypoint missions one by one starting with the last one of the series.
-"Exit waypoint flight planning?" and tap "Save and Exit".
-Wait...