We use AGOL sparingly (corporate policy restricts our use of it). However, I would like to learn if it's possible to use one of our cached images in ArcGIS for Server/Portal in AGOL. I don't see much literature on the subject anywhere, so I'm surmising that it might not be possible. But it would be very handy to be able to transfer a cached image that we have already created using ArcMap as a map service to AGOL. We can certainly create map services directly from ArcMap to AGOL...imagery would be nice too :-). This would really help when we need a better image for use in our ArcGIS Collector app when gather data from the field.