About extending of access for a user with ‘wdm_instructor’ role:
It seems that ‘Instructor Role’ plugin re-creates ‘wdm_instructor’ role dynamically, not once on plugin activation like others do. Additionally it applies own restrictions for such user, modifies the list admin menu itesm available for this user.
You can try to deactivate ‘Instructor Role’ plugin temporally and you will see some new items at the left side admin menu, which it hides.
So ‘Instructor Role’ set own hard limits for user permissions with ‘wdm_instructor’ role, which is not editable via usual WordPress roles.
URE “admin menu access” add-on is needed to block/hide menu items, which available for this role already. It does not provides access to the menu which is not available for a role. So use it with care.