input remap not working for fuse core, am I missing a step?

Please can someone help me with game input remaps? I’m specifically trying to map the “z” key to x button on my 8bitdo controller for the game “AticAtac” run on the fuse core (zxspectrum)

So I know the controller is working fine as I can move in game correctly and bring up the keyboard overlay. I have input 1 set as kempston Joystick and input 3 as Keyboard, this standard for the fuse core. In the quick menu - options - joypad X button mapping, hit OK the select “Z” from the scroll down list. then select manage core options and I select game options and it tells me it has saved core options for AticAtac.opt

when I return to the game the key binding doesn’t work even after restarting retroarch and loading the game up again.

If I go into options again it show the “z” as X button as it should do. Am I missing something? another step?

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You have to save a game remap, not a core override.