I saw this post in the eLearning Heroes community today where a user asked about creating a slideshow with 10 images that restarts once the last image is shown. One suggestion was to use a setup with a layer that is used to ‘loop back’ to the baselayer and thereby restarting the slide’s timeline. That’s a perfectly fine option to create a loop.
I wanted to explore another option: use a looping motionpath animation to update a counter variable which in turn would show/hide the pics. One advantage of this option is that other actions could happen on the slide’s timeline without being stopped/reset by the looping of the pictures.
Here is the Storyline setup. It’s one slide WITHOUT any layers, ten pics and an offstage object that is continuously looped.

It doesn’t get any simpler than that!
Here is the final result of the test. I left the slide’s seekbar enabled so that you can see how the slide’s timeline reaches its end after just 1 sec, and yet the slideshow keeps playing. Also, I added a keypress trigger so that pressing the Spacebar pauses and resumes the slideshow.
There you go, just one more option to create looping slideshows in Storyline.