For a ton of amazing suggestions from the mobile speedrunning community and all the resources you need, join the mobile speedrunning Discord: https://discord.gg/bpY8zeB

On Samsung S7, I use the native recording app and sometimes DU Recorder to record my games. Each has its perks. For the timer, I use a simple app called Floating Speedrun Timer.

On Amazon Kindle, I use SmartPixel to record, upload to Facebook, download, and add a timer in a video editing software called ShotCut. I'm not sure if this specific game is on that device, though.

If you have a different way of recording and timing, please share!