If I add features to a map, I'm able to create a custom form for it in the Field Maps Web App.
If I add that feature to a group, via Map Viewer (Beta), the custom form still appears in the Field Maps Mobile App; however, when I launch the Field Maps Web App, that feature now shows up under the Reference Layers group, grey'ed out, with a message "Editing of this content is disabled".
How can I edit forms of features that are grouped? Do I have to create a form, then add the feature to a group; and, if I need to edit the form in the future, do I then have to take the feature out of the group, save the map, go into the Field Maps Web App, edit the form, then go back into the map, and move the feature back into the group?