With the artboards set-up and the sliders positioned appropriately, the first step will be to create the trigger area for the tap. You could set a tap on the entire artboard to create the transition, but to add fidelity to the interaction, it is best to create a target area, like an arrow, to trigger the animation.
Start by drawing a rectangle on the right side of the slide in Artboard 1. Give this a gradient that goes from non-transparent to transparent, starting from the outer edge. Use an icon plugin or a vector icon like Streamline Icons, to add in a chevron or arrow pointing to the right.