The ArcGIS Web Editor October update includes enhancements and new functionality throughout the software such as the capability to paste multiple features into a different layer with the same geometry type, and temporary reference layers.
Highlights are listed below:
- Copy multiple features and paste them into a different layer. The target layer must be editable and share the same geometry type as the copied features.
 - Add temporary  layers to a map, which allows you to copy and paste features into a different layer to add features to a map in ArcGIS Web Editor.
- Search for layers in ArcGIS Online, your organization, or your content.
 - Add a service from a URL.
 - Upload local files, such as a zipped shapefile, or CSV, KML, GeoJSON, or GPX format files.