Where do the moviegenre icons go?

First and foremost – thanks for this wonderful skin. I love it as do all my family members. Very beautiful and easy to navigate.

Now my question:

I use the Holiday.png icon for my holiday movie category. But it seems every up grade all the files in the directory except Default.png go missing.

I keep a backup and just copy back to /storage/.kodi/addons/skin.rapier/extras/moviegenres

Is there a reason for this?

Should I not be using these icons?

Is there a way I can point my setting to a different folder than /special?

Thanks