How do I remaster my Canvas course gradebook with my SIS gradebook?
As an instructor, you can re-sync your entire Canvas gradebook to your SIS in the Grade Sync page. Remastering grade passback for your course re-syncs your Canvas course gradebook to your SIS gradebook. However, unlike a typical SIS grade sync, you cannot select or deselect assignments to include in the sync. A remaster sync includes all grades for all assignments that you have set up to sync with the SIS.
Open Grade Sync

In Course Navigation, click the Grade Sync link.
Open Grade Sync Utilities

In the Grade Sync page, click the Utilities tab.
Confirm Remaster

Click the Remaster Grades button. Remastering your gradebook posts grades to all sections in your course for all selected assignments.