I save kits in folder by designer (or one called "Collabs").
I copy the preview & put it in a sub-folder of my "Kit Previews" folder-- "events", "everyday life", "camping", "spring", one folder for my daughter, one for my son, "Disney", etc. I can copy the preview to as many folders as I want-- for instance, I have a copy of the kit preview for
Magical: Mermaids in my summer folder as well as my daughter's folder. And since the designer & kit name is always on the preview, it's easy to find.