PowerShell Usage - File Upload Directory - powershell

Question

I am hoping to get some assistance on PowerShell usage for HTTPS file upload. My current task to automate the copying of a directory of PDF file from a local network path to a HTTPS:// website. Whilst I have a local account on the web server, I have an issue with file upload and recursing the list all PDF's.
I tried Invoke-RestMethod -URI
$sourceFilePath = Get-ChildItem "\\DFS-Netwrok\PDF" -Recurse -Include *.pdf
$siteAddress = "https://contoso.com/PDF";
$urlDest = "{0}/{1}" -f ($siteAddress, "*.pdf");
$UserName = "UserName"
$Password = "Password"
function uploadFile() {
Param ([string] $sourceFilePath,
[string] $siteAddress ,
[string] $urlDest,
[string] $UserName,
[string] $Password)
$webClient = New-Object System.Net.WebClient;
$webClient.Credentials = New-Object System.Net.NetworkCredential($UserName,$Password);
("*** Uploading {0} file to {1} ***" -f ($sourceFilePath, $siteAddress) ) | write-host -ForegroundColor Green
$webClient.UploadFile($urlDest, "PUT", $sourceFilePath);
$httpresponse = $httprequest.GetResponse()
}
Upload-File -File $SourceFilePath -URI $SiteAddress -Dest $URLDest -Username $MyUsername -Password $MyPassword
Currently I get error on Upload-File.
I am happy to convert to any code which can provide the above task, list PDF from internal path connect to website with User/Pass and upload all PDF from local Directory. I can confirm the account can connect and has correct permissions on the destination website URL.
I am also looking at this example with error "Forbidden":
$Dir="\\Netwrok\Path"
$Url = "https://Website/PDF"
$user = "User"
$pass = "Password"
$webclient = New-Object System.Net.WebClient
$webclient.Credentials = New-Object System.Net.NetworkCredential($user,$pass)
foreach($item in (dir $Dir "*.pdf"))
{
"Uploading $item..."
$uri = New-Object System.Uri($Url+$item.Name)
$webclient.UploadFile($uri, $item.FullName)
}
Returns error:
Exception calling "UploadFile" with "2" argument(s): "The remote server
returned an error: (403) Forbidden."
At line:16 char:22
+ $webclient.UploadFile($uri, $item.FullName)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : WebException