You can record your phone's screen by using the built-in app of your device. To do so, kindly follow the steps below:
1. Device settings > Control Center
2. Press the '+' button beside the Screen Recording option
3. It will now be added to your device's quick controls. To access, kindly swipe down or swipe up your screen depending on your device model, and the recording button will now be available.
4. Log in to the game and you may now record the issue you want to bring up.
5. After recording, the video will now be saved to your device's Photo gallery.