I’m hoping that this is still being watched.
I tried out importing brush bundles on Android (Samsung Galaxy Tab S7 running Android 11) and when I do so, I get checksum error messages.
I asked about it on this thread: Krita For Android Beta; Feedback and Bugs and included a screenshot.
(I ended up giving up on it and deleted Krita and then reinstalled and haven’t tried importing any brushes since).