FTP upload script only uploading single file from directory at a time. Want all the files to go up

param (
    $localPath = "C:\WinDSX\output\*",
    $remotePath = "/from-dsx/",
    $backupPath = "C:\WinDSX\Uploaded files",
    $logPath = "C:\WinDSX\log.txt"
)
try
{
    # Load WinSCP .NET assembly
    Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"
 
    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
        Protocol = [WinSCP.Protocol]::Sftp
        HostName = "somedomain.com"
        UserName = "someusername"
        # Password = "mypassword"
        SshHostKeyFingerprint = "somehash"
        SshPrivateKeyPath = "someprivatekey"
    }
 
    $session = New-Object WinSCP.Session
 
    try
    {
        # Connect
        $session.Open($sessionOptions)
 
        # 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)
            {
                $logMessage = "Upload of $($transfer.FileName) succeeded, moving to backup"
                Write-Host $logMessage
                Out-File -FilePath $logPath -Append -InputObject $logMessage
                
                # Upload succeeded, move source file to backup
                Move-Item $transfer.FileName $backupPath
            }
            else
            {
                $logMessage = "Upload of $($transfer.FileName) failed: $($transfer.Error.Message)"
                Write-Host $logMessage
                Out-File -FilePath $logPath -Append -InputObject $logMessage
            }
        }
 
        # Delete all files in the output directory except the log file
        # Get-ChildItem "C:\WinDSX\output" -Exclude (Split-Path -Leaf $logPath) | Remove-Item -Force
    }
 
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
    }
 
    exit 0
}
catch
{
    $errorMessage = "Error: $($_.Exception.Message)"
    Write-Host $errorMessage
    Out-File -FilePath $logPath -Append -InputObject $errorMessage
    exit 1
}