There are multiple ways of doing this:
(A) Chop each page in half: top half becomes the ‘image’ for question, bottom half becomes the ‘image’ for answer.
(B) Two pages per flashcard, one for question and one for answer (maybe do this if pdf is in landscape mode).

This would be immensely helpful as currently you can only import text, which is an issue if your flash cards have diagrams or render LaTeX.