Making "Jump to next slide when user clicks.." contingent on completing interaction

I have a slide with several layers, each of which is triggered by the learner clicking the relevant button. The layer contains more details about each topic with an image and a text box. I don't want them to be able to click NEXT to jump to the next slide until they've clicked all the boxes. How do I suppress that trigger until all the layers have been displayed? I tried setting up a T/F variable but I couldn't figure out how to tie that variable to the buttons. Thanks.

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