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Which attributes are kept when performing a union of two features?

Question asked by idaeus on Jul 5, 2018

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.