After some serious frustration, I finally figured out how to enable editing of existing points in a feature service. . . however, I cannot convince collector to allow me to add new points. I consistently get the error "no collectable layers visible," no matter which layers I have visible (including: blank "map notes," other blank editable feature, and the feature service that I can edit). The feature service is currently set to allow editors to "add, edit, or delete" features. I have tried both with and without enabling sync. Any advice would be appreciated.