How to use symlinks?

I was wondering how I create a folder in seafile that is a symlink from another folder. Basically I want the folder to show in my files but the storage is on another device/folder that is attached to my docker. Is this possible and if so how? Which folder are files stored on within seafile?

If you want to mount data into a library this is not possible.

If you just want to tell your server to store everything at another location. That is possible.