upload to drop off library using CSOM documents not routing

Question

Using PowerShell and CSOM, I'm able to upload to the Drop Off Library but the document never routes. Working with SP2016 on-prem.

• Manually uploaded documents route correctly.
• CSOM uploaded documents will route only after I edit the properties and click save (no changes are made to the metadata).
• My account is in the Records Center Web Service Submitters group along with Site Owners.

Example of the script I'm working with:

        $FileStream = New-Object IO.FileStream($File.FullName,[System.IO.FileMode]::Open)
        $FileCreationInfo = New-Object Microsoft.SharePoint.Client.FileCreationInformation
        $FileCreationInfo.Overwrite = $true
        $FileCreationInfo.ContentStream = $FileStream
        $FileCreationInfo.URL = $File
        $Upload = $List.RootFolder.Files.Add($FileCreationInfo)

        $item = $Upload.ListItemAllFields
        $item["Router"] = "B" 
        $item.Update()
        $RemoteContext.Load($Upload)
        $RemoteContext.Load($item)
        $RemoteContext.ExecuteQuery()