ImLibretro handle memory card save in the same way other frontends do

this to avoid slow down due to constant read/write,

so user need to ensure to stop emulation from the stop button,

not to close the app it self, otherwise the frontend will not safe anything

however, in ImLibretro as extra, there is option in the "Save" icon (in-game)

this usually used for save state (slots), but they have extra helper at the end,

this option called Sync MemCard which will ensure that MemCard synced with actual file,

it can reduce the risks of losing progress due to crash or closing the app directly.