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Good for you hehe. Maybe there are free custom brushes online too. Do check it :)

Nahh the custom brushes are limited to premium

I mean the ones other artist's create for free? Ibis paint has that and you only need a qr code to import that brush. Maybe medibang is very strict with 3rd party brushes

Medibang is pretty strict. Only you can use your custom brushes like in clip studio where you can do your own brush customisations