WinSCP .net assembly file mask not working
                Here is the code, the file mask is not working - all files are being put on the ftp:
    
                
                
                
            
            
        try
{
    # Connect
    $session.Open($sessionOptions)
   
    $transferOptions = New-Object WinSCP.TransferOptions
    $transferOptions.TransferMode = [WinSCP.TransferMode]::Binary
    $transferOptions.FileMask = ".txt"
   
   # Sync files local and delete any that are not on the SFTP
   $synchronizationResult = $session.SynchronizeDirectories([WinSCP.SynchronizationMode]::Remote, $SourcePath, $FtpPath, $True, $False, [WinSCP.SynchronizationCriteria]::Time, $transferOptions)
         
    # Throw on any error
    $synchronizationResult.Check()
}
finally
{
    # Disconnect, clean up
    $session.Dispose()
}