I have an usb midi interface (UM-ONE) and from April to September I used it normally and everything seemed to be working fine (when i used to plug it to the phone a prompt box would show up to request for MIDI access).
Currently the prompt box doesn't show up neither the keyboard works. I've tested everything literally: resetting the permissions, testing on other apps (and it works normally on them), clearing the cache and even uninstalling the app itself.
Any help would be great
My device: Galaxy note 8