AWESOME. So far every thing has work thank you so much!

Hey guys. i just got my pi3 and I set up recalbox and it runs like a champ! I love it. Im new to this, I'm just now getting my feet wet. But there is a few issues I was wondering if anyone else had a fix for or was  experiencing  themselves. 1. Mame, when I go to map the start key and coin key it will not recognize the  buttons on the controller. Controller is a rock candy Xbox 360. 2. When I map keys in ES they work perfect. Now when I got to a n64 rom for  instance the "b" button is now the "y" button. 3. When I try to add psx Roms they fail and say size is to large cant upload. The sizes are only like 4-500 mb. Now it will start then stop and disappear really quick. 4. And last. Every gba bios I try to add fails. Incorrect file or format. Thanks guys. I appreciate any help.