If you’re using the Tap trigger to progress the slider, it can actually be created using component states, and built within a single artboard. Using a component for your slider will make it, and the mechanics, reusable across the design.
The process begins in the same way, with just Artboard 1, and three rectangles. This time, once the rectangles are grouped, create a component, either with the right click menu, or the hotkey (CMD+ K on Mac, CTRL+ K on Windows).