error when opening Canvas every single image not loading 'Failed to load resource: Preflight response is not successful'

When I try to open up APS Instructure Canvas and select any course, every single image loads with the '?' and Failed to load resource: Preflight response is not successful. Please help me! I can't make changes to the original html. But images won't work!
Also, idk what tag to add, so I'll do web.