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Try clearing the browser cache and cookies and disable any ad blockers or extensions.
I usually contact the instructor and ask them to enable the HEIC file format in Canvas. Many of my instructors are willing to allow the HEIC file form
Have you tried resetting the SMC and NVRAM, then booting into Safe Mode. Also I recommend reinstalling macOS.
If Gradarius isn't recognizing your login credentials, try entering them again carefully. If you're still having trouble, just contact Gradarius suppo
