I'm wondering if someone has experience importing custom basemaps in ArcGIS Online? This will later be used in the Collector app. The imagery comes from LiDAR so it covers a very specific area, to expand on that I wanted to have a basemap layer under the LiDAR imagery to fill in the blank space. So far I've been able to import the LiDAR image file (.ecw) but I have been unsuccessful in bringing the basemap along with it. I've tried export the basemap image to a .tiff or .ecw, combining the LiDAR imagery file and basemap file to generated a map server tiling scheme tool, and created a web layer from there.
Any insight would be greatly appreciated!