...
    $session.SessionLogPath = "C:\path\to\winscp.log"
    # Connect
    $session.Open($sessionOptions)
    ...

# Load WinSCP .NET assembly
Add-Type -Path "C:\ci\WinSCPnet.dll"
 
# Set up session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Sftp
    HostName = "####"
    UserName = "####"
    SshHostKeyFingerprint = "ssh-rsa 2048 #####"
    SshPrivateKeyPath = "######k"
}
 
$session = New-Object WinSCP.Session
$opt = New-object Session.SessionLogPath -
 
try
{
    # Connect
    $session.Open($sessionOptions)
 
    # Set up transfer options
    $transferOptions = New-Object WinSCP.TransferOptions -Property @{
        PreserveTimestamp = $False
    }
    
    # Transfer files
    $session.PutFiles("C:\ci\upload\", "/upload/*", $False, $transferOptions).Check()
}
finally
{
    $session.Dispose()
}
 

try
{
    # 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 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx"
    }
 
    $session = New-Object WinSCP.Session
 
    try
    {
        # Connect
        $session.Open($sessionOptions)
 
        # Upload files
        $transferOptions = New-Object WinSCP.TransferOptions
        $transferOptions.TransferMode = [WinSCP.TransferMode]::Binary
 
        $transferResult = $session.PutFiles("d:\toupload\*", "/home/user/", $False, $transferOptions)
 
        # Throw on any error
        $transferResult.Check()
 
        # Print results
        foreach ($transfer in $transferResult.Transfers)
        {
            Write-Host ("Upload of {0} succeeded" -f $transfer.FileName)
        }
    }
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
    }
 
    exit 0
}
catch [Exception]
{
    Write-Host $_.Exception.Message
    exit 1
}