You keep making mistakes. The kmls run smoothly and are built differently from how you make them. The icon in the userdata / usericon is not foreseen because it is already present in the kml branding ...
Insert the kml and delete the file "poi_visiblities_save.txt".
I think the system created by Garigor is well explained by stefando in [Only registered and activated users can see links. ]

Spoiler: img
[Only registered and activated users can see links. ]


What a tag and tag ... You use a lot of programs and you have a lot of theory but then you don't put it into practice.