I just installed the ShareRenamer from the app store. Installation went perfect and easy. Unfortunately the menu which allows renaming does not appear when I click on the … in the share section. I have rebooted the server just to be sure everything loads ok. (See attached screenshot)
ShareRenamer is only supported till Nextcloud 17. Perhaps you better not use it. I use a script outsite nextcloud (domain.tld/s/xyz instead of cloud.domain.tld/s/xyz) with an php-redirect to the nextcloud sharing url. Not fine but works also with all bookmarks if you are interested send me a PM.
ShareRenamer till Nextcloud 17: https://apps.nextcloud.com/apps/sharerenamer