Move local files to another local directory after powershell script SFTP file watcher exchange

Question

This is the script I'm using at the moment for file watching and uploading found here:

Watch for changes in local folder and upload them to SFTP server

How can I add in the function to move the local files to another local directory after successful SFTP upload?

# Watches a directory for new files and
# fires off the batch file to push to connection

$remotePath = "/data"
$localPath = "C:\pathTo\watchfolder"
$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = $localPath
$watcher.Filter  = "*.csv"
$watcher.IncludeSubdirectories = $True
$watcher.EnableRaisingEvents = $True

### LISTEN FOR CREATE
Register-ObjectEvent $watcher Created -SourceIdentifier FileCreated -Action { 
    try
    {
        $localFilePath = $event.SourceEventArgs.FullPath
        Write-Host "Local path: $localFilePath"

        $assemblyPath = "C:\Program Files (x86)\WinSCP"
        Add-Type -Path (Join-Path $assemblyPath "WinSCPnet.dll")

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

        $session = New-Object WinSCP.Session

        try
        {
            $remoteFilePath =
                [WinSCP.RemotePath]::TranslateLocalPathToRemote(
                    $localFilePath, $localPath, $remotePath)
            Write-Host "Remote path: $remoteFilePath"

            # Connect
            $session.Open($sessionOptions)

            # Check if corresponding remote directory exists, if not, create it
            $i = $remoteFilePath.LastIndexOf("/")
            $remoteDirPath = $remoteFilePath.SubString(0, $i)
            if (($remoteDirPath.Length -gt 0) -and
                !$session.FileExists($remoteDirPath))
            {
                Write-Host "New subdirectory, creating $remoteDirPath on server"
                $session.CreateDirectory($remoteDirPath)
            }

            $session.PutFiles($localFilePath, $remoteFilePath).Check()

            Write-Host "Upload of $localFilePath succeeded"
        }
        finally
        {
            # Disconnect, clean up
            $session.Dispose()
        }

    } #end of first try 
    catch
    {
        Write-Host "Error: $($_.Exception.Message)"
    }
} #end of action


while ($True) { sleep 5 }

I've tried to cobble in this function, but it won't work:

  # Upload files, collect results
        $transferResult = $session.PutFiles($localPath, $remotePath)
 
        # Iterate over every transfer
        foreach ($transfer in $transferResult.Transfers)
        {
            # Success or error?
            if ($transfer.Error -eq $Null)
            {
                Write-Host "Upload of $($transfer.FileName) succeeded, moving to backup"
                # Upload succeeded, move source file to backup
                Move-Item $transfer.FileName $backupPath
            }
            else
            {
                Write-Host "Upload of $($transfer.FileName) failed: $($transfer.Error.Message)"
            }