I'm trying to use Affinity Designer's vector brush creation ability and following Paolo Limoncelli's excellent tutorial (on Affinity Spotlight). I have AD on desktop so perhaps that's part of the issue (his tutorial is for iPad). He says when you export your brushes you export each slice as PNG 24, but I don't get that as an option ( I just see PNG or PNG 8 dithered). Do I opt for one of these or should I be seeing PNG-24. I had a look for previous discussions and someone mentioned not ticking the transparent background box in your document setup, but whether ticked or not the export options are as above.
I completed his tutorial using PNG (as opposed to 8-dithered) and it seemed to work fine so maybe PNG is PNG-24 or maybe I've missed something.
Any help would be greatly appreciated.