I have several hosted feature services already published to ArcGIS Online. I know I can download them, add a global ID in Arc Map then republish. Is it possible to add a global ID directly to a hosted feature service?
Global ID is a database table property and can be enabled in ArcGIS Desktop/ArcGIS Pro (Add Global IDs—Help | ArcGIS Desktop ). Once the fields have been added you need overwrite the hosted service.
I hope this helps!
~Shan
Enabling sync for the hosted feature layer will add a GlobalID field to the hosted feature layer.