SeafDav not working and giving errors

I just set up Seafile and SeafDav and would like to use it to back up my laptop. However, SeafDav is currently not working properly. When I try to read the root folder, it appears to be empty. I think that it is supposed to contain all of my libraries. When I try to read any non-root folder, whether it exists or not, I get error 404. When I try to do any write operation, I get error 403. This behavior is common to all WebDAV clients (I’ve tried Duplicati, Dolphin, and the web browser), but the web interface is functioning perfectly. I don’t have this behind Apache or Nginx. How can I troubleshoot this?