Déclencher la diapositive suivante depuis un calque

Hi, Poste.

Thank you for clarifying!

I understand you want to use the player's buttons (Previous / Next) to move through the layers in your slide.

My suggestion for a workaround is to use a variable that counts the user's movements, so it changes the button's behavior. 

In my attached example, I have two slides, and the first slide has two layers. When the user clicks the next button, it uses the value of the variable "Layer" to decide which layer to show. It also adds a value of one to the variable every time the user clicks the button. When the user is on the last layer (and the variable's value is now 3), clicking the button jumps to the next slide).

The opposite happens with the previous button: it moves backward through the layers and subtracts the value. 

Here's the preview:

I hope this helps!