Accessing Cloud from macOS
The URL provided in the Nextcloud interface does not work in any of the clients tested. You will need to use https://cloud.robojackets.org/remote.php/dav/files/gburdell3/ instead, replacing gburdell3 with your GT username.
As with other uses of the WebDAV interface, you will need to generate an app password to log in, as Nextcloud does not know your GT password.
Information taken from https://docs.nextcloud.com/server/13/user_manual/files/access_webdav.html.