Hi @brisch!
I’m sorry but there’s no way to create something like this. The thumbnails can only be used for navigation inside the slider.
You could create ‘thumbnails’ with different links if you would build your own thumbnails with Row, Column, and Image layers. The downside of this is that you would have to add this “thumbnail row” to every slide of your slider. You could create it on one slide and copy it to the others using the Copy option at the Layer List:
https://smartslider.helpscoutdocs.com/article/1815-layer-list
but if you would need to make any changes (e.g. adding a new image) you’d have to update every slide manually.
The upside of this is that you could mark which thumbnail represents the currently visible slide’s image.
Alternatively, you could use a Static Overlay:
https://smartslider.helpscoutdocs.com/article/1764-slider-settings#add-slide
to create these thumbnails. A Static Overlay is a special slide that appears on top of all other slides in the slider, without switching away. The upside of this is that you won’t have to modify the thumbnails on each slide, but the downside is that you won’t be able to mark which thumbnail represents the currently visible slide.