[Where are brushes and other goodies are stored??]

Hello,  Created a new brush category but it does not populate.  I import the ABR file, get a successful Import screen, but no brushes in the category or anywhere else. Where else do I look?.  This is so annoying.  Currently I have to generate in PSD the brush work,  export then import to Affinity.  Not a good way to work.  Please advise...
Thanks! 

Just found out about the Persona selections and can see the brushes, but when I try to use it doesn't show anything.  Marching ants but not the brush image....