WinSCP .NET assembly (PowerShell) PutFiles from UNC path only uploads 1 file

#Start
Write-Host ("Start script.")
 
try
{
    # Load WinSCP .NET assembly
    Add-Type -Path "c:\program files (x86)\winscp\WinSCPnet.dll"
 
    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions
    $sessionOptions.Protocol = [WinSCP.Protocol]::Sftp
    $sessionOptions.HostName = "**********"
    $sessionOptions.PortNumber = 0000
    $sessionOptions.UserName = "**********"
    $sessionOptions.SshPrivateKeyPath = "C:\FTP\******\Private-Key\*******.ppk"
    $sessionOptions.SshHostKeyFingerprint = "ssh-rsa 2048 68:92:****************:15:5e:78"
    
    Write-Host ("Connecting.")    
    $session = New-Object WinSCP.Session
 
    # Upload files
    try
    {
        # Connect
        $session.Open($sessionOptions)
      
        $localPath = "\\SOMESERVER.fqdn\EDI\SOMEFOLDER\TEST\EXPORT\"
        $remotePath = "/TEST/IMPORT/"
        $backupPath = "\\SOMESERVER.fqdn\EDI\SOMEFOLDER\TEST\SAVE\"
 
        #File list:
        Write-Host ("File list: ")
 
        #transferoptions
        #$transferOptions = New-Object WinSCP.TransferOptions
        #$transferOptions.FileMask = "*.*"
      
        # Upload files, collect results
        $transferResult = $session.PutFiles(($localPath + "*.*"), ($remotePath + "*.*"), $False)
 
        # Iterate over every transfer
        foreach ($transfer in $transferResult.Transfers)
        {
            # Success or error?
            if ($transfer.Error -eq $Null)
            {
                Write-Host ("Upload of {0} succeeded, moving to save" -f
                    $transfer.FileName)
                # Upload succeeded, move source file to backup
                Move-Item $transfer.FileName $backupPath -force
            }
            else
            {
                Write-Host ("Upload of {0} failed: {1}" -f
                    $transfer.FileName, $transfer.Error.Message)
            }
        }
        #End of files:
        Write-Host ("End of files. ")      
    }
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
        Write-Host ("Disconnected.")      
    }
 
    exit 0
}
catch [Exception]
{
    Write-Host $_.Exception.Message
    exit 1
}

15:47:18.770 Status code: 3, Message: 521, Server: This server does not support operations to modify file attributes., Language:  
* 2016-02-03 15:47:18.770 (ETerminal) Permission denied.
* 2016-02-03 15:47:18.770 Error code: 3
* 2016-02-03 15:47:18.770 Error message from server: This server does not support operations to modify file attributes.
. 2016-02-03 15:47:18.770 Asking user:
. 2016-02-03 15:47:18.770 **Upload of file '***********.xml' was successful, but error occurred while setting the permissions and/or timestamp.**
. 2016-02-03 15:47:18.770 
. 2016-02-03 15:47:18.770 If the problem persists, turn off setting permissions or preserving timestamp. Alternatively you can turn on 'Ignore permission errors' option. ("Permission denied.
. 2016-02-03 15:47:18.770 Error code: 3
. 2016-02-03 15:47:18.770 Error message from server: This server does not support operations to modify file attributes.")
< 2016-02-03 15:47:18.770 Script: Upload of file '*************.xml' was successful, but error occurred while setting the permissions and/or timestamp.
< 2016-02-03 15:47:18.770 If the problem persists, turn off setting permissions or preserving timestamp. Alternatively you can turn on 'Ignore permission errors' option.
< 2016-02-03 15:47:18.770 Script: Permission denied.
< 2016-02-03 15:47:18.770 Error code: 3
< 2016-02-03 15:47:18.770 Error message from server: This server does not support operations to modify file attributes.
* 2016-02-03 15:47:18.785 (EScpSkipFile) **Upload of file '***************.xml' was successful, but error occurred while setting the permissions and/or timestamp.**
* 2016-02-03 15:47:18.785 
* 2016-02-03 15:47:18.785 If the problem persists, turn off setting permissions or preserving timestamp. Alternatively you can turn on 'Ignore permission errors' option.
* 2016-02-03 15:47:18.785 Permission denied.
* 2016-02-03 15:47:18.785 Error code: 3
* 2016-02-03 15:47:18.785 Error message from server: This server does not support operations to modify file attributes.
. 2016-02-03 15:47:18.785 Script: Failed
> 2016-02-03 15:47:19.347 Script: exit
. 2016-02-03 15:47:19.347 Script: Exit code: 1
. 2016-02-03 15:47:19.347 Closing connection.
. 2016-02-03 15:47:19.347 Sending special code: 12

#transferoptions
$transferOptions = New-Object WinSCP.TransferOptions
$transferOptions.FileMask = "*.*"
$transferOptions.FilePermissions = $Null # This is default
$transferOptions.PreserveTimestamp = $False
      
# Upload files, collect results
$transferResult = $session.PutFiles(($localPath + "*.*"), ($remotePath + "*.*"), $False, $transferOptions)