Show additional layer after all other layers visited
I have a slide where I want students to visit information on 3 layers. I then want a 4 layer of summary info to appear, but ONLY after they have visited all of the other 3 layers. I also want the Next button to stay disabled until the timeline on the 4th layer ends.
I have tried numerous variable settings and cannot get the 4th layer to appear. I even tried adding a hidden Continue button that triggers the 4th layer and set the button to hidden state and to not change to normal state until after the other 3 layers have been visited. That option didn't work either. I am totally stumped on how to get this to work.
I created a sample version of what I'm trying to accomplish since my project has proprietary info and cannot share that file.
So to summarize, I want the students to click 3 items to view 3 layers of info. When they close the 3rd layer, I want the info on the 4th layer to appear or have a button appear to access the 4th layer. Either option is fine with me. Once the 4th layer timeline ends, then the Next button should turn to Normal state.