2) If you aren't seeing a "lock" icon in place of the image when in student view, or correcting the publish state of the file doesn't correct the issue, can you describe the steps you're using to add these images?
2) If you aren't seeing a "lock" icon in place of the image when in student view, or correcting the publish state of the file doesn't correct the issue, can you describe the steps you're using to add these images?