Post grades and comments/annotations separately
You can post grades and comments separately for each assignment.
Canvas considers annotations to be part of grades.
Go to Grades in your course.
Mouse over the header of the assignment you want to apply grade/comment release dates. Click the three vertical dots.
Click Grade Posting Policy.
Select Post grades Manually.
Check Schedule Release Dates.
Select the Release Options. Choose Grades & Comments Together or Separate Schedules.
For Grades & Comments Together, input the desired Release Date and Time.
For Separate Schedules, input the desired Grades Release Date and Time and Comments Release Date and Time.
Click Save.