Yes, admins can adjust the roles of users by going to My School Settings > Users.
Click on the pencil to edit the user and adjust the role. The role change will stick regardless of how they are shared via a 3rd party API (Clever, ClassLink, GG4L).
If you upload users via a user file, be sure to adjust the role on the file as well.
Here is a summary of what access each adult role has:
|My School Settings||✅|
|Teacher Attendance & Substitutes||✅||✅|
|My Activities, Student Search, and Student Attendance||✅||✅||✅|