In Tridion Sites 9.1, is it possible to have a mix of extensions that do and do not use the Add-on Service?
For example, could I have a GUI Extension that I've downloaded from the SDL App Store that needs deploying using the Add-on Service alongside some other legacy GUI extension that I've deployed 'manually'? (As long as these don't impact one-another, obviously).
I would assume that I can and that the manually deployed extensions just don't appear in the Add-ons section of the GUI, but was hoping someone could confirm before I start my upgrade.