Add a "token" option to the sftp plugin.
right now the sftp plugin uses a userid and password, however many systems use a one-time-token (like Google Authenticatior).
After the password prompt there is another prompt for the token, however GC doesn't currently have a away to handle this.
On some systems the 'Verification code:' prompt comes prior to the "Password:" prompt, this is configurable.
Windows applications like WinSCP (https://winscp.net/) handle this additional prompt without issues.
away -> a way