Dear zzyzxroad,
Good news for you and for all who want to create "kml-branding" in "folders in folder" in Luna:
[Only registered and activated users can see links. ]
Spoiler: in poi_visiblities.txt:
Spoiler: in Petrol_Stations.icons:
Spoiler: result:
This way is workable in Nextgen as well.
Deleting "poi_visiblities_(save).txt" in folder ".../save/..." before use or update is mandatory too.
Bookmarks