I want to transfer game files from the iOS “files” app

I don’t want anyone to take this the wrong way, but I consider myself quite knowledgeable and self-taught when it comes to the internet, desktop computer hardware, and software. With that said, I believe Apple intentionally makes things confusing for customers, leading to frustration and giving up. For instance, their file management app is needlessly complicated. Who names an app ‘FILES’? At this point, I refuse to pay extra for iCloud storage. So please help me get my files transferred