Published wiki : inserting files links to a private url (unauthorized)

Hi, I think i’m very confused. Such questions were already discussed in a previous thread about seafiledocs : SeafileDocs updates (v1.1.0): File tags improvement and simplified draft and review process - #2 by gauburtin

I tried but I don’t understand how to achieve this only with links.
I remember an upload button that saved the file in a 'download" folder…

I was thinking about limiting access to a published wiki. But i suppose that browsing the library in the context of a group is the same.