Trigger to move to next slide from final layer using hotspots

Hello, I am familiar with similar programs but new to Articulate, so forgive me if this is a fundamental question.

I am building several training modules.

1. I am not using the timeline - the user clicks or swipes to advance. 
2. I am using layers to add more content to a slide. I am using full-screen hot spots, so they can click anywhere on the screen to advance. Once the user clicks, the next piece of content is displayed. I want it required that they see every layer before moving to the next slide.
3. I am also using full-screen hotspots on every slide (on the base layer if there is only one layer and on the final layer if there are layers), so the user may advance by clicking anywhere on a slide to advance, as well as using the advance and previous arrow buttons at the bottom of the screen.

So, here's my problem - it's only when a slide has multiple layers.  If I leave the "click or swipe to advance" trigger for the user on the base layer, the user is able to use the advance arrow button to advance to the next slide before they see of all the content on a screen.

I am unable to add the "click or swipe to advance" trigger to any other layer; it's attached to the base layer. That means that the advance arrow button doesn't work on the final layer; the user must click on the hotspot to advance. I've tried adding a state of Visited on the content in the final layer but that didn't work. I want them to have both choices. What am I doing wrong? Thanks!