Sharing with file replication?

Hello all, maybe just a simple question, but I am still figuring out how to accomplish this;
At home I run a Nextcloud server where I put files in a directory that I share (federation sharing) with the Nextcloud server of my brother. Well, I assumed that the files are replicated to that server in the directory of the specific user, but I noticed that only a link to these files is there and that the acutal content is only available on my server. How (if possible) can I make Nextcloud copy the contents of the directory to the remote Nextcloud server, or do I have do this by hand via scp for example ?
Thanks and regards,
Arnhem, Netherlands