#search latest files
$dir = "C:\Users\Admin\Documents"
$latest = Get-ChildItem -Path $dir | Sort-Object LastAccessTime -Descending | Select-Object -First 1

#we specify the directory where all files that we want to upload
$Dir="C:/Users/Admin/Documents/"+ $latest.name

#ftp server
$ftp = "ftp://ftp.someaddress.com/dir/"
$user = "login"
$pass = "password"

$webclient = New-Object System.Net.WebClient

$webclient.Credentials = New-Object System.Net.NetworkCredential($user,$pass)

#list every sql server trace file
foreach($item in (dir $Dir "*.trc")){
    "Uploading $item..."
    $uri = New-Object System.Uri($ftp+$item.Name)
    $webclient.UploadFile($uri, $item.FullName)
 }