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This guide explains how to use ngrok with SFTP and why FTP or FTPS are not a good fit for TCP tunneling.

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Compatibility with FTP and FTPS

FTP and FTPS (FTP over SSL) require multiple dynamic ports for data transfer between server and client, so ngrok is not a good solution for that traffic. Use SFTP instead, which uses a single port.

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ngrok with SFTP

You can use ngrok for SFTP by starting a TCP endpoint on the port your SFTP server uses, usually port 22 (the same as SSH). 
ngrok tcp 22
TCP endpoints are only available on a free plan after adding a valid payment method to your account.
From there, use the resulting TCP address in your preferred SFTP client to connect to your local server.

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Alternatives to FTP for sharing files

If you’re just looking for a quick way to serve local files, ngrok has a built-in file server.