If you study medicine, or anything else, and have a picture in which you generate occlusion cards, and if there is something missing in the picture you would be able to add that and then generate a new card.
For example, if you have a great picture of the heart with names of the different parts where there are lines drawn to the parts AND there is one important part that is missing in that picture… you could add a text box then draw a line to the part. Then you can generate an occlusion card even on the one you added yourself.
What I am requesting is to be able to draw and add text boxes on pictures! Anki has this feature which is really useful.