Schedule each individual slide within your slideshow.
Create A Placement For Each Slide
Each slide of your slideshow should be it's own Otto placement. A set of Otto placements can then form your slideshow.
Add The Slideshow To Your Theme
Go to your themes customizer to add the 'Otto Slideshow' section to any of your sites pages. Within the slideshow add each individual slide.
Use the Otto app to schedule images to appear within each of your slides.