We currently have 10.7.1 ArcGIS Image Server that is a stand-alone site.
If we want to upgrade to 10.8.1 or higher can Image Server still be stand-alone? Is federation with Portal required?
Looking at documentation it states Image Server is part of ArcGIS Enterprise but it's not clear if it can remain stand-alone or if it needs to be federated with Portal to function.
https://enterprise.arcgis.com/en/image/10.9.1/get-started/windows/steps-to-get-arcgis-image-server-up-and-running.htm
Thanks!