My Layers are not Showing in Preview?

Thanks first to @Sandra Collins.  This was actually the route that I chose to go (first) because I was stuck, couldn't get it to work and that's how it could be done in PowerPoint.  But I was hoping that Articulate was NOT only as good as working in PowerPoint or why use it?

But further thanks go to @Wendy Farmer!  Looking at your actual example helped me to solve for what I was doing incorrectly!  All was good - except that I was moving the timeline start of the Layer to where the cue point was on the Base Layer timeline.  Why?  No idea!  In my mind, I had to have it start there vs it being an item simply controlled by the Cue Point trigger on the Base Layer timeline.  That makes TOTAL sense and I have no idea how I was straying down the wrong road on using Layers/ Cue Points.  THANK YOU!!!!