I have an existing Map Image Layer (MIL) that is hosted on our ArcGIS Server and made available via a Rest service. Within the MIL there are 50+ feature layers which are grouped by theme. My organisation provides a webmap via ArcGIS Online which displays all the layers contained within the MIL. Updates can be made to this MIL (i.e. adding or removing layers) by first updating the database on ArcGIS Server and then republishing the service via ArcGIS Desktop. Updating existing layers is relatively stragithforward, but I now have had to add a new layer to this MIL. We plan to add the new layer to the webmap along with the existing layers. I've succesfully added the new layer to the MIL. When I try to add this new layer to the webmap it seems that I have to add the entire MIL service which contains every single layer. I can’t just add the new layer to the map. I appreciate I could replace the layers in the webmap with the layers in the MIL, but it means going through and resetting all the pop-ups which will be an onerous task. My question is, can I add a single layer from an MIL which contains multiple layers to an existing webmap?
