What, if any, workflows are available to round trip data between ArcGIS Desktop and an ArcGIS Online for Organizations (AGOL) web map with editable feature layers?
For example, we have a web map with an editable feature service layer. Some staff might add features to the map using ArcGIS.com Map Viewer, others with ArcGIS Online Explorer, and still others with ArcGIS Desktop. Nothing needs to be done for the first two, as soon as the map is saved the other application will see it. However for ArcGIS Desktop, the so-called powerhouse in this equation, there doesn't seem to be a way to synchronize or upload changes back to ArcGIS Online. Is this really the case?
There aren't any SDE or databases in the mix, just ArcGIS Desktop with file geodatabase and AGOL.
Update: ArcGIS Server is not involved at all (disregarding that's what Esri uses power AGOL behind the scenes, as there is no meaningful interaction with it from a user perspective).