Can't add a new folder sync connection

New Nextcloud 13 user on KDE Plasma 5. Can’t add a new folder to make a new Folder Sync connection. The message I receive says I need to remove the currently configured root folder because I am already syncing all of my files. All the folders in my list are user owned files. One possible exception is my Thunderbird email default file found in .thunderbird. Any thoughts?

Received an answer from another user. Multiple folders are not permitted. All sync items belong in a common folder. Multiple folders will sync by using a softlink.
Example: I want to sync everything in a test folder on my desktop. I would build a soft link to an actual folder for it within my nextcloud folder. In a terminal, I would use the following ln - test/ /home/username/nextcloud/test