When creating an assignment, I check the "post grades to SIS" button. It then does add itself to my powerschool gradebook when I post grades. All good. Then, as more and more students complete the assignment, and I attempt to post the grades after checking the assignments, the grades do not update in my gradebook. So then i go back to the edit screen of the assignment in canvas, and the SIS box is now unchecked, even though I originally did check it and save, and the assignment is there in the gradebook. Am I doing something incorrectly?