Icon failed

Continuing the discussion from Astro Items+Sitemap+Map+♈ Binding Example:

Hello Justus,

I have copied the icons to your manual on my Raspberry PI in the folder, once in SVG and once in PNG format.
In the SITEMAP then set the icon to “moonphases”. Unfortunately, the picture remains empty for me then. On all platforms, Android and PC on the web. at basicui.

What could that be?

many many thanks

Karl Heinz

Could you post your sitemap and items?
And also and example of how the icons are named in the /icons/classic folder