Copy from one scene to another in Preview Editor

I can copy a source from a scene, however, when I use “paste” in Preview Editor to another scene, it only pastes to the original scene. Also, “text from file” has no functionality regarding how to handle line breaks. It used to work – now it doesn’t. This all seems very basic. Stuff that used to work doesn’t anymore. I’m using the latest version v.4.3(4.3.2202.1228). Can anyone give any insight? It’s frustrating as hell.