I am trying to name my sketches to keep organized, but I have noticed a new behaviour: often the name I enter reverts to the default "Sketch #" when I move the mouse or soon after. You can see that reversion in my attached screencast. (I'm so glad I figured out that feature!)
--Edit I guess I didn't figure it out. It never got attached and I can't add it once I edit.
https://knowledge.autodesk.com/community/screencast/73b96ace-916c-462f-9693-78e0cbd68429