When you want to work together and have multiple people embed instruction into an assignment, that's when you'll co-author.
FYI: The original creator of an assignment has the ability to remove invited co-authors. If invited co-authors want to edit their own copy, they can duplicate theassignment.
STEP 1: Select the assignment you would like Co-author
STEP 2: Search the names of colleagues you would like to Co-author with. Then select “Invite”
There will be a banner across cover tiles that are being co-authored.