Dear user,
The geospatial attribute is not supported (yet) in Arena Mobile!
You can use it now in Arena web to show a polygon on the map. You can upload polygons in GeoJSON format or you can use the geospatial attribute as a read-only field where you use the geoPolygon function; for example, if you have a multiple entity/table called "table" with a coordinate attribute called "location" inside of it, you can call the function geoPolygon(table.location) and generate a polygon using that locations.
In a near future we will support it also in Arena Mobile.
Let us know if you need some support from our side, or if you have any suggestions.
Many thanks,
Open Foris Team