# Path to WinSCP .NET assembly
Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"
 
# Session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Sftp
    HostName = "blah.com"
    UserName = "XXXXX"
    Password = "XXXXX"
    SshHostKeyFingerprint = "ecdsa-sha2-nistp256 256 xx:xx:xx etc"
}
 
$session = New-Object WinSCP.Session
 
try {
    # Open SFTP session
    $session.Open($sessionOptions)
 
    # Upload file (local -> remote)
    $transferResult = $session.PutFiles(
        "C:\doz\", # local path (can be wildcard)
        "/New/" # remote folder or file path
    )
 
    # Throw if any transfer failed
    $transferResult.Check()
}
finally {
    $session.Dispose()
}