Copy / Paste Stopped Working - Glyphs 3

Hi. New here! I’m hopping on because the Copy/Paste feature in my full-version Glyphs 3 doesn’t seem to be working. As we all do, I like to be able to duplicate certain features of my work for use across the entire letter set. But. I hit “copy” and then “paste” and nothing happens. The keyboard hotkeys are also not producing any results.

Has anyone else encountered this issue?

Is the feature you are trying to paste into set to Generate feature automatically?