Issue putting file to webdav location

Add-Type -Path ".\WinSCP-5.13-Automation\WinSCPnet.dll"

# Setup session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
      Protocol = [WinSCP.Protocol]::Webdav
      HostName = "webdav.domain.com/"
      PortNumber = "443"
      UserName = "account"
      Password = "P@ssw0rd"
    }
 
$session = New-Object WinSCP.Session
# Connect
$session.Open($sessionOptions)

# Upload files
$transferOptions = New-Object WinSCP.TransferOptions
$transferOptions.TransferMode = [WinSCP.TransferMode]::Automatic
       
#$transferResult =

$session.PutFiles("C:\uploadtest.csv", "subdirectory/uploadtest.csv", $False, $transferOptions)
$session.PutFiles("C:\uploadtest.csv", "/subdirectory/uploadtest.csv", $False, $transferOptions)
$session.PutFiles("C:\uploadtest.csv", "./subdirectory/uploadtest.csv", $False, $transferOptions)
$session.PutFiles("C:\uploadtest.csv", "./uploadtest.csv", $False, $transferOptions)
$session.PutFiles("C:\uploadtest.csv", "/uploadtest.csv", $False, $transferOptions)
$session.PutFiles("C:\uploadtest.csv", "./uploadtest.csv", $False, $transferOptions)

# Throw on any error
# $transferResult.Check()

    $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
      Protocol = [WinSCP.Protocol]::Webdav
      HostName = "webdav.domain.com"
      WebdavSecure = $True
      UserName = "account"
      Password = "P@ssw0rd"
    }