Using the Prev button with layers

I have created a slides that have numerous ayers and have successfully disabled the next button. However, I want the prev button to work within the layers (click prev and go back one layer).

How do I accomplish this?  I have tried added a trigger to each layer to activate the previous layer when user clicks, but it is not working. As it stands now, when the user clicks the prev button, it takes them back to the previous slide regardless of where they are in the layers.

Thanks!

 

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