Apologies if this is basic and/or I am missing something. Currently I am moving over from the classic web map viewer to the all singing new map viewer to build a "web experience". This has all been a bit painful as the classic viewer and a pre configured wed app was all so simple to use. Have stuck with it and am starting to appreciate some of the new features. However cannot seem to add a WMTS as a backdrop in the new map viewer. This is an essential feature for my client am I missing something? See from the product road map that it should have been introduced this past winter.
Any ideas??