Can I use shortcodes in the slides?

Yes you can put shortcodes into any text items (html, heading, paragraph) or into the html widget, but it’s up to that shortcode’s plugin, how it will be displayed (could be responsivity or z-index problems), and if it will work properly, because this part is handled by WordPress and that plugin, not our slider. You can’t put a slider’s shortcode into another slider, because it’s one of the limitations.