The start screen icons, especially the factory ones for templates, and descriptions on how to add images seemed very vague to me.
So i dug in to it and have done a "how to" pdf about it.
https://drive.google.com/file/d/1J8zPeMlhRe5BVFwTHHJ42IB-EUodg_7J/view?usp=sharing
Added 23feb2021.
I've made some generic 400x400 pixel images with numbers in frame. Could be useful.
https://drive.google.com/file/d/1LFx4tWFdZby9KnGMf84L1WhxHQc6zmvS/view?usp=sharing