I was having trouble with the import of images into Canvas using Respondus. I found several items in the community related to this, but all came to the conclusion that it was not possible because it is an issue between the Respondus tool and Canvas. However, we had a different experience.
With the Respondus tool that pushes the quiz into Canvas, there is an option to import the quiz as a Question Bank only or a Quiz.
We found that the image does not get imported correctly if you use the import as Question Bank only option, but it does work if the import as Quiz is selected.
Selecting the Quiz option creates both a Canvas quiz and a Canvas Question Bank. Since our goal is only the bank, we then have to go back in and delete the actual quiz.