Thanks rich2005. The video helped me to understand what you meant with naming properties. I can now only export the layers to C: (which is OK). But on my computer it still doesn't do what it should. When I go into the designated folder, I only see one image (that is one level; one piece out of 30). I can see all the different levels piling up and then there is just the last image visible. But they are not as separate images like in your example. I compared the settings with yours and I don't see any differences.
Would you have any idea about that as well?
Would you have any idea about that as well?