I'd recommend using the built-in screen recorder of your phone, but in case yours didn't come with one or you are looking for a alternative, this one is one of the best screen recorders, to use it follow these steps:

1 - Open the Play Games app . 2 - Select a game. 3 -At the top of the game details page, tap Record gameplay. 4 - Select a video quality setting and then Next. 5 -Tap Launch. A floating video bubble will appear with recording settings. 6 - Tap Start recording. After 3 seconds, your game will start recording. To stop recording, drag the floating video bubble into the center of the screen and hold it over Close.