"User not logged in" when trying to convert file in link share

Hey all,

maybe someone can give me a hint.

When I create a link share for users without account, the three-point-menu in an office file’s line reads “convert as” apart from “download”.

When such a user opens the link and tries to convert e.g. a Microsoft Office file into PDF or ODT via the three-point-menu, action is refused and a pop up reading “user is not logged in” appears.

However, if the unregisteted user clicks on that file and opens it in Office via Collabora Online, they can convert it via “file” menu and then “download” menu.

Do I just miss a setting to allow them to convert files directly without opening Collabora Nextcloud Office or is this pointless because impossible?

Thanks in advance for any help.