Definitely much more to this story, but they basically wanted you to do a part of their job for them. It's common and mostly understandable, as they might not remember everything that you did. They'll have to re-word everything anyhow.
I'd understand if we were asked to pick what we felt was worth highlighting and provide some supporting data, but we effectively were doing the same amount of work on our own packets as before the shift. Just with a due date a couple weeks sooner so our manager could have time to edit.
