I bought this yesterday because I am a truck driver and I miss playing video games but I’m always on the road. I have an iPhone XR so I know it’s compatible but only after I bought it and tried to set it up I saw YouTube videos saying you need to buy an  Xbox controller and connect it every single time you play? I’m confused. Why do I need a controller for my controller. How exactly does it work, can I or can I not have a portable controller traveling the US?