There are a number of methods one can use to publish raster datasets to ArcGIS Server. One method is to simply add the raster datasets to a map document, and publish the map document. The layers in the mxd simply reference raster data sources. This is what we have done with one of our services that contains historic data.
When this method is used, I cannot add an individual layer from the server to a web map in AGOL. One can do this when the data source is feature class, but it does not appear to support when the data source is a raster.
The dialogue that appears states : Error The layer is not supported and can not be added to the map.
Why is this the case?
I did note I can add the entire Map Service to the web map (as opposed to individual layers).