Hello,
I am having trouble enabling a web map for offline use (ie. in the web map's settings, I can't seem to get it to provide the offline tab/options. I have two things in my map: a hosted tile layer (vector tiles) which I have checked the box for "Allow this layer to be downloaded and used in an offline map." I also have an cached map service in the form of an aerial image. The image was recently re-published with the advanced setting option checked for "Allow clients to export cache tiles." Both the vector tiles and the aerial are in the same coordinate system. The aerial image map service is on an ArcGIS Server (10.6.1) and the Vector Tile Layers are hosted on our Enterprise Portal (10.8.1). The web map is also in this Portal environment.
As far as I can tell, the layers satisfy all of the criteria for offline use according to this article: https://doc.arcgis.com/en/arcgis-online/manage-data/take-maps-offline.htm
Am I missing any critical piece of information that would prevent the web map from providing the option to be taken offline?
FWIW I plan to use the map in Explorer for ArcGIS. The map is visible and available in Explorer but has no offline options.