How to use sftp with sshgate

[obriat]

Hi,

I manage to use scp with sshgate (scp localfile sshgate@sshgateserver:sshinnerlogin@innerserver//path/) and I already used sftp with wallix, but I couldn't find a way to use sftp with sshgate.

If it's possible, could you please provide an example and update the doc ?
If not, could you implement this feature ?