Use a SFTP server (with SSH/SFTP Server app), and then connect it from any SFTP client on computer (such as WinSCP), or rclone for synchronization (rsync won't work since it requires a rsync binary running on remote if I remember correctly).
Use a SFTP server (with SSH/SFTP Server app), and then connect it from any SFTP client on computer (such as WinSCP), or rclone for synchronization (rsync won't work since it requires a rsync binary running on remote if I remember correctly).