Copy Image with changes

I am having students graph triangles onto an image with the graph as a background. I want the image with their triangles to appear on subsequent slides. How do I do this?

Does something like this help?

Hi -
I am trying to do something similar, but I want kids sketches to appear on the subsequent page (so they can add an additional line to their graphs). Here is what I have so far, after modifying your code. Something isn’t quite right - do you mind checking it out and letting me know what I need to change in the CL on slide 2?

You need to publish, and then share. There isn’t any content

Updated link - thanks!!