I switched to New Quizzes and Item Banks. I recently had my students take a quiz, and two images didn't show up for the students taking the quiz. I always upload images using the Rich Content Editor, I upload all files from the course I use to create Item Banks, and I share Item Banks across courses.

I was told from Canvas support that, "The image in question was associated with another course and, therefore not accessible from the current course". However, when I ran the Course Link Validator, the images did not show up. Does the Course Link Validator not work with item banks? If it does that the images in question did not show up when I ran it, how can I tell whether images will be accessible to my students or not? 

I never had this issue before and obviously troubleshooting with a room full of students is stressful for myself and the students.