How to change galley file in ojs 3.2.1.1 AFTER publication

Hi,
we just upgraded to 3.2.1.1 and I find that I cannot now amend a galley pdf (change the file AFTER Publication) as I could do with the earlier version of ojs. It was easy with the old version but I cannot find the option in 3.2.1.1

Please help. There’s a ‘create new version’ button - is that where I need to go? I’m nervous about clicking on it lest I set off an event I don’t want.
Screenshot from 2020-07-21 21-32-06
Screenshot from 2020-07-21 21-35-40