When you detach a MySQL database (and its user), and then go to re-attach it, there is no category for “MySQL Users”…out of curiosity, I saw that the user was listed under MariaDb User, so I tried that and it worked fine. So, to import the detached MySQL db and its user(s) you have to import the database under MySQL but the user under MariaDb …it works, but its not obvious. Just reporting the (maybe) bug. Thanks!