How to change galley file in ojs AFTER publication

we just upgraded to 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

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