I've actually had a lot of trouble HUION 420 with Affinity Photo. It doesn't seem to recognize pressure sensitivity with even the basic brushes nor does it work with certain brushes altogether, I.E. texture brushes.
I've sifted through a lot of forums and I understand that you have to customize each brush individually and only some of them have options for pressure (which still doesn't actually detect pressure) but honestly, it just doesn't seem to work or the solution isn't intuitive.
I don't know if Affinity Photo isn't designed be used with graphic tablets, if it's the specific tablet I have that doesn't work with Affinity Photo, or if I'm missing some setting that will fix my problems but this is a HUGE problem that other free photo editors don't have any issues with. It's incredibly disappointing this paid software is has such difficulty with such a critical feature.
Maybe I'm overlooking the solution but if anyone has any suggestions I would be grateful for the advice.
