Currently, if the analytical model has been updated in Revit and the updated configuration is sent to Robot Structural Analysis for analysis, even when "Update only selected part of structure" is selected, any loads that have been applied in Robot are removed and replaced with those defined in Revit.
If there are no loads defined in Revit, the loading (point, area loads etc.) is deleted in Robot.
As there are elements, like "cladding", that can only be defined in Robot and not in Revit, some area loads can currently only be drawing inside of Robot. Because they cannot be hosted from Revit's side.
This means that analytical model changes can no longer be made in Revit and sent to Robot because those area loads would be deleted.