We have a couple of custom WAB apps for general mapping/editing feature services and the next step is to provide an offline editing/sync environment for users with connectivity limitations. They will not have a desktop (arcmap) solution. I have been looking at the .net runtime SDK documentation and also the 'license your app' guidance from ESRI and it seems like these two might work together somehow since the WAB apps can be registered to have an AppID generated through AGOL. Is there a way to use an existing WAB app with the SDK to enable offline editing/sync of the feature services via windows desktop? Or must one start from scratch with the SDK/visual studio?