Thanks for the info.
For the NES I needed it to say
input_player1_b_btn = the player1 part was needed.
I also did as your video suggested and put it above the first loading line, not sure if both was needed or just the player1 part. but that’s fixed that issue.
Is there a video on customizing lr-imame4all control buttons per game? I’m assuming it works the same way, but I can’t seem to see if they call the inputs button_1 A_1 or what have you. I’ve tried select+X and some games i’ve seen a remapping option, but it’s never let me select/modify it.