I see that the Citation layer can be added as a separate layer and that would have some usefulness, at times. I think you have missed my main question a little. If you add the World Imagery service as a basemap, then you do not get the metadata functionality, correct?
It seemed redundant to have to add another layer then to get the metadata functionality. Perhaps the software prevents the metadata functionality in the basemaps, and that is the reason.
Adding the Citation layer in 3 times and resetting the scales and filters will no doubt work, but seems easier to just add the World Imagery as a map layer. I just made a map using the plain dark canvas as the basemap and the World Imagery as the last map layer. Seems to work fine like that.
Either way, this additional functionality is great and not difficult to get working, even if adding a separate layer. Having it work through the basemap just streamlines things a little.
Thanks for your thoughts.