If you do not want to add an Attachment to your Post, please leave the Fields blank.
(maximum 10 MB; please compress large files; only common media, archive, text and programming file formats are allowed)
$transferOptions = New-Object WinSCP.TransferOptions
$transferOptions.SpeedLimit = xxx
$session.PutFiles("C:\BackupTemp\*.rar", $remotePath1, $False, $transferOptions).Check()