How to import server local files/folders or attach a server local folder to Seafile?

Hi all,
I am very new at Seafile.
I have installed a Seafile 7.0.5 server to share very big files (HD movies, it’s all legal).
I have already some files on my server and I want to see these folders into Seafile, without having to upload again (it is huge).
If there some way to do this?
Thanks for help.
Patrick