Teachers and Course Designers can add and edit Momotor assignment configurations.
Teachers and (Grading) Teaching Assistants (TA) can review the results for the submissions by all students. They review all the results whether the assignment has been published or not.
Course Designers can only configure assignments, but cannot view the results.
Canvas allows users to have multiple roles. The (Grading) Teaching Assistants (TA) and Course Designers roles can be combined to allow a user to both configure assignments and view the results.
Students can only see the published results for their own submissions and the submissions made for a homework group they are member of.