If you have your Android device with Kodi installed on it, you might want to
add remote folder using ssh/sftp protocol.
Since it's a bad security practice setup a ssh access allowing to log in using a
password instead of the ssh key, the setup should be done by using such file.
If you ever done this before in an OS as GNU/Linux or MacOS you'll be already familiar with the process and concepts as ssh, public/private keys, etc. If that's not your case, I recommend you to check the previous link.