Now we need to configure SSH. Issue the command:

sudo nano /etc/ssh/sshd_config

In that file, look for the line:

Subsystem sftp /usr/lib/openssh/sftp-server

Change that line to:

Subsystem sftp internal-sftp

Scroll to the bottom of the file and add the following:

Match Group sftponly
ChrootDirectory %h
ForceCommand internal-sftp
AllowTcpForwarding no
X11Forwarding no

Save and close the file. Restart the SSH daemon with the command:

sudo systemctl restart sshd

Now on the remote system, you can SFTP in via

sftp USERNAME@ipaddress