Tracy Valleau
suggested this on Jun 21 17:15
Maybe I just haven't figured out how to do it, but if not, then I'd like to suggest that you allow more than one image per step.

I end up copying/pasting multiple images into another application then screenshot the combination. would be slicker to do this within SS

Jeff's solution is the only way to get two images in a single step in version 2. Another solution for some folks is to create a step with a title and an image followed by another step with an image and then instructions. The images will appear to be part of the same step when exported, assuming you have the instructions appearing below the image.
Support for multiple images in a step is something we have planned for a future version of ScreenSteps.