Create an SFTP server on Windows 11

In computing, the SSH File Transfer Protocol is a network protocol that provides file access, file transfer, and file management over any reliable data stream.

 Source

OpenSSH is available in apps > optional features > Add an optional feature

In the search box search for openssh and download and install it

Next navigate to Privacy & security > Windows Security > Firewall & network protection > Advanced settings

go to inbound rules and set the rule for open SSH to the same as the above screenshot

outbound rules. It should look like this 

Tap on New rule > port > specified remote ports , and type 22

Next you'll need to allow port 22 from you're router home page. Get the IP address by typing ipconfig in the command prompt

Enter the IPv4 address in the browser, login with your router username and password which can usually be found on the bottom of the modem

Look for secure shell service in the NAT section of advanced settings and use your IPv4 address. Make sure the port is 22

Open the search function and search for services. Locate openssh server and left click it. Go to properties and allow it to start automatically 

Then start the service

Now you can connect remotely to your favourite SFTP client like FileZilla and WinSCP by using your IPv4 address which you can find in Network & internet. You'll also need to enter your Microsoft login credentials and you might need to specify 22 in the 'port' field. To connect via other device the address would be SFTP://"your_IPaddress":22