Link Existing Directory into Seafile Server?

I’ve setup a new Seafile server. On that same machine, I have an existing folder with files. I don’t want to move that folder. Can I include that existing folder into the server without copying/duplicating it?

Do I need to install the client software on the server machine or can this be done from the web version?

you can use seaf-import.sh
https://manual.seafile.com/deploy_pro/seaf_import.html