True/False Variables Based on Player Controls

I'm trying to create a variable that changes from "false" to "true" when the learner clicks the next button in the player.  After they've completed this on a number of slides, it branches back to the main slide and allows them to click the next button on that slide to continue with the module (basically, they have to complete all slides before they can continue).  However, I can't get the true/false variable to switch when they click the next button on the content slides.  I've attached the portion I need help with below.  Any ideas?

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