I have the Miyoo Mini+. I originally used MinUI and it saved games like a normal GBA and loaded the game to the menu everytime I started it, again like a standard GBA worked. I switched to OnionOS to have a nicer interface with boxart and now it only uses save states and auto starts from said state when opening a game. Not an authentic experience.

I have learned there's a difference between game saves and save states but don't know how to switch my handheld to use only game saves. Is it based on the core used maybe? Can anyone help me out?