Please follow our guide on SSH Sessions and then come back to this article to connect to your Raspberry Pi using SFTP.

Therefore before you can use SFTP you need to enable SSH on your Raspberry Pi, and create a tunnel to access SSH through. SFTP uses a service on your Raspberry Pi called SSH, that allows secure transfer of data. A Device Monitor and Remote Terminal is included, and you can also create your own Custom Tunnels to access services running on your Raspberry Pi. PiTunnel is a service for remotely accessing your Raspberry Pi, and the projects that you build on it. All your Raspberry Pi needs is an internet conection and PiTunnel will do the rest. We will do this by using the Custom Tunnels feature of PiTunnel. In this article we will guide you through how to use PiTunnel to allow you to access SFTP for your Raspberry Pi from anywhere in the world. You can do this with PiTunnel by making use of SSH and SFTP (Secure File Transfer Protocol). It is often necessary to transfer files to your Raspberry Pi when it is out at a remote site. How to remotely transfer files to and from your Raspberry Pi over the internet

How to use filezilla ftp raspberry pi