In you LAN network, you are accessing using Windows Share (SMB), which is not supposed to do it via public Internet.

So here is what you can do:

  1. Set up openvpn or wireguard server on S1300, then connect to the vpn server from remote, then you should be able to access your files.

  2. Set up S2S using GoodCloud (you need another GL.iNet device), so that you can access device from each end.

  3. Set up some server on S1300, e.g. sftp, http and access your files from the Internet.