We have noticed that KMLs will not display when added to a offline map. In our situation we are using *.VTPK's generated from ESRI services of portal items. There are sometimes situations where our users would like to view KMLs while they do not have access to the internet. When adding KMLs to portal item basemaps they display fine, we don't have any special methods or properties set when adding KMLs to offline maps.
Any help would be appreciated I am lost on why they don't appear.
Thanks,
Aaron