How to manage Layer/Player Triggers with multiple layers

I'm having an issue with Slide and Player triggers not functioning on a Slide with multiple layers. I have 3 slide layers: the first (base) layer has one button that shows layer 2. Layer 2 contains a button that shows layer 3.

I'd like the "Next" button to be disabled until layer 3's timeline is complete. So far I've tried placing the triggers in the base layer Triggers panel and also in layer 3's Trigger panel, but neither option is working. I have been successful with disabling "Next" on the non-interactive, single layer slides.

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