Texturing questions photoshop/cellphone adobe ptho..

Hello unreal community. I"m taking pictures to place in a video game un fortunately all i have is my cell phone. But my cell can record in 4k and is 20 mega pixels. Now When i goto manual mode on my cell phone it say 2mp=1920x1080,3 2048x1536 and etc… I’m aiming toward unreal and console that means all my pics have to be 2 mega pixels??? filll me in somebody

You’ll want to edit them to make them tiling, square, etc. anyway. Taking your photos at the highest possible resolution and downscaling them later is probably your best choice.