You can upload your slides (.PDF) to Contrast. Anyone inside the Studio will have control over your slides. This is handy when you're presenting with multiple people as you don't all the time have to ask "next slide please".

You can easily move slides forward or backward using the controls. By clicking on the slide itself in the preview panel, you add or remove them to the stage.

Next to slides, you can also upload images (.JPG, .PNG) GIFs and Videos (.MP4).