I’m having the same problem as well. I was able to import an ABR brush file into Designer a couple of weeks ago to use in the pixel persona. I bought Photo to use with my new iPad Pro yesterday and now all ABR files are greyed out for importing into either application. It doesn’t matter where I try to import them from (iCloud, Google Drive, or On My iPad). I also have procreate installed and their logo is on the ABR files.