Show pop-up after last item in repeating group is clicked


I’ve created an app where users can submit pairs of photos as a project. Projects are randomly displayed and visitors select which photo is their favorite by clicking on it (think ‘hot or not’). After the user clicks, the next project (pair of images) is shown.

My question is, how can I show a popup after the image is clicked from the last project displayed in the repeating group?

I’m assuming it’s accomplished with a conditional on the repeating group, but I’m struggling to figure it out.

Thanks in advance for any help!

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