Using multiple attachments through comObject Outlook.Application - email

Question

I have a script that goes into SCSM, gets the relevant files from the IR and downloads them properly onto the user's computer.
Next, I need the script to create an email from the client's outlook application and display it on their screen before sending the email..
Here is the part of the script that does that:
$GetFiles = Get-ChildItem "$ArchiveRootPath\$IRID\"
$ol = New-Object -comObject Outlook.Application #| New-Object Net.Mail.MailMessage
$mail = $ol.CreateItem(0)
$mail.To = "johndoe#contoso.com"
$mail.Subject = "This is a test [$IRID]"
Foreach($GetFile in $GetFiles)
{
Write-Host “Attaching File :- ” $GetFile
$attachment = New-Object System.Net.Mail.Attachment –ArgumentList C:\Temp\SCSM_Archive\$IRID\$GetFile
$mail.Attachments.Add($attachment)
}
$inspector = $mail.GetInspector
$inspector.Display()
However, when I run the script, I get this error:
Attaching File :- email.eml
Exception calling "Add" with "1" argument(s): "Value does not fall within the expected range."
At C:\Temp\SSWireless Script.ps1:99 char:2
+ $mail.Attachments.Add($attachment)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : ComMethodTargetInvocation
All the variables are checked from the previous part of the script that downloads the files. PS is able to see the files, but cannot attach them to the email.
I don't want to use the send-message function due to the fact that we will be moving to a cross domain email account and would rather use outlook to create the email itself.

Answer 1

Here is a reference for Microsoft.Office.Interop.Outlook Attachments.Add method . This confirms that the first parameter (and the only parameter in your case) needs to be a full path to file.
There is no point passing [System.Net.Mail.Attachment] .NET objects to COM interface.
Your code should look something like this:
$GetFiles = Get-ChildItem "$ArchiveRootPath\$IRID\"
$ol = New-Object -comObject Outlook.Application
$mail = $ol.CreateItem(0)
$mail.To = "johndoe#contoso.com"
$mail.Subject = "This is a test [$IRID]"
Foreach($GetFile in $GetFiles)
{
Write-Host “Attaching File :- $GetFile.Name"
$mail.Attachments.Add($GetFile.FullName)
}