Syncthing has a trouble syncing to symlinks/junctions, my Pictures\~sync folder is a symlink/junction to another hdd.
images Watching for changes encountered an event outside of the filesystem root: f.root==\\?\C:\Users\[redacted]\Pictures\~sync, root==\\?\e:\~user\pictures\~sync, path==\\?\c:\users\[redacted]\pictures\~sync. This should never happen, please report this message to forum.syncthing.net.