Multilayer Basemap for 3D-Scenes in ArcGIS Portal BasemapGallery possible?
Hi,
In our ArcGIS Portal (10.8.1) we use own/custom basemap-gallery for the maps and scenes.
Recently I discovered the "multilayer-basemap" possibility, a way to get multilayer-basemaps into the basemap-gallery.
(Choose basemap—ArcGIS Online Help | Documentation - Publish a web-layer with the features, new map with the MapService, move to "basemap", define map as selectable basemap, tada 
)
That works perfectly, if I open a new map, that multilayer-basemap is selectable from the basemap-gallery.
However if I switch to "Scenes", I can not select that multilayer-basemap.
Why? I'm a bit lost.... is it beacuse the MapImageLayer is "Cache: dynamic from data" and thats not compatible with scene basemaps requirements ? Or should it work and I did something wrong in the workflow?
The usecase: 2 basemaps "Satellite" and "Hybrid". Hybrid is basically the satellite image + some vector data on top. Therefore I would rather not cache RasterTiles for the satelllite image two times... since its exactly the same appart from the "on top vector data"... with multilayer-basemaps that would be solved and the "cache: dynamic from data" would result in always "up to date" vector-data in the hybrid basemap.
I'm aware that it would work with a vector tile cache... but I'm curious about the MapImageLayer
Many thanks in advance,
Andi
