I have prepared a quiz on CANVAS. The first student accessed the quiz and all of the images appear as big locks, rather than the images I embedded into the questions. I tried to follow the instructions provided to ensure that the images were "published" so that the students could "see" them, however when I check the quiz in STUDENT VIEW, they still appear as big locks. I currently have students trying to take the quiz within the time limit provided, but cannot since they cannot see the images for each question. Please help!