# Load WinSCP .NET assembly
Add-Type -Path "WinSCPnet.dll"

# Setup session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Sftp
    HostName = "example.com"
    UserName = "user"
    Password = "mypassword"
    SshHostKeyFingerprint = "ssh-rsa 2048 xxxxxxxxxxx...="
}

$session = New-Object WinSCP.Session

try
{
    # Connect
    $session.Open($sessionOptions)

    # Upload
    $session.PutFiles("C:FileDumpexport.txt", "/tmp/Outbox/").Check()
    # file exists, I created the directory and a file for testing.
}
finally
{
    # Disconnect, clean up
    $session.Dispose()
}

Exception calling "Open" with "1" argument(s): "Network error: Invalid argument"