How can I review my incorrect questions after completing assignment?

I have used Khan for several years, but the new update has me stumped on how to view the completed questions from student assignments: specifically, I want to review my students' incorrect answers so that we can retry and teach through them together.

I've tried searching on the community board, searching in my teacher portal, my students' portals, but to no avail.

Does anyone know how to review the questions from completed assignments?