I cannot download offline areas in the Field Maps app from a map I created AGOL. It appears one of the issues is the creation of forms for feature layers.
To test it, I created a map with a single feature layer. I was able to download an offline area from the map. I went back and created a form for the feature layer and tried to download an offline area; this time it failed.
Is there a setting on the form or something I'm missing?
