Hi Jeffrey,
While the PopupManager fully supports editing, the PopupView that is in the toolkit currently only supports viewing the attributes at this time. If you need Popup editing now, you can consider changing the source of the toolkit control to do what you need. You can see here that the attribute value is displayed as formatted text in a QML Text element - https://github.com/Esri/arcgis-runtime-toolkit-qt/blob/master/Import/Esri/ArcGISRuntime/Toolkit/Cont...
The idea is that the PopupManager is the brains behind the PopupView, so you can use the information from the manager to update the view accordingly. A few things you will for sure need to do to get going:
- change the model of the repeater in the PopupViewBase.qml from PopupManager::displayedFields to PopupManager::editableFields
- use the various roles in the PopupAttributeListModel to know what to display (TextBox for string input, ComboBox for domains, Calendar for Date picker, etc) PopupAttributeListModel Class | ArcGIS for Developers