We have the web app builder (in ArcGIS Online) configured to edit polygons. When using the union tool we cannot determine which attributes from the 2 input polygons will end up in the 1 resulting polygon. It doesn't seem to be random, but it also doesn't seem like a user can do the edit (such as selection order) in such a way to know which attributes will be kept. Derek Law
The big issue here is that one can loose data when merging a new polygon with few attributes with an existing polygon that's rich with attributes.
Any help/ideas is appreciated.