I’ve tried what they said to try. I am running ArcGIS Pro 2.4.2 I’ve double-clicked the file and it opens up Pro but does not add anything to the map/screen. Do you know of another way or if anyone else is having this same issue??
Resource Information Specialist - GIS
RWU-4158 Southern Research Station
Rm 233 Lehotsky Hall, Clemson University
Clemson, SC 29634
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Caring for the land and serving people
I read that it would produce files in your project folder. Not sure about automatically adding the contents of the file to a map. I presume you tried to find the data and see if it could be added manually?
Could it be that all of the maps or scenes in this project are closed? If you open the Catalog pane, Project tab, Maps folder, you will find all the maps saved in that project and can open them from there.