Sorry, should have put that in the first post. DT 3.9.4 and OS 14.3. It is not document specific. I have tried to do this on at least 20 different documents in my database. It is the same for all of them. If I don’t highlight anything at all in a PDF and just make a bunch of notes in the annotation pane, hit Summarize, nothing at all happens, as if the box is empty.
Same with md docs. I have just typed a bunch of garbage notes into the annotation just to test. Hit summarize. Nothing happens.