Correct way to add PDF attachments by file in New-TrelloCard

[user8446]

Hi Adam,

I have tried -fileSource "C:Path\Path\File.pdf"

and

$File = Get-Item -Path "C:Path\Path\File.pdf"
-fileSource $File

and

$File = [IO.File]::ReadAllBytes("C:Path\Path\File.pdf")
-fileSource $File

and

added 'ContentType' = 'multipart/form-data' to the $RestParams for the Invoke-RestMethod API call.

None work. Removing -fileSource allows the new card to be created. What is the correct way or syntax to add an attachment via New-TrelloCard?
My guess is this has something to do with the encoding as Add-TrelloCardAttachment works fine with .txt but fails with PDF

Update:
I figured it out doing the API call direct. The file needs to be in a form using system.io.fileinfo. I'm on PowerShell 7 and I believe you might have to get into some .NET to make it work on PS5.1.

$FORM = @{
    idList     = "xxxxxx"
    pos        = "top"
    name       = "TestTest"
    fileSource = [system.io.fileinfo]"C:\Path\Path\File.pdf"
}

Invoke-RestMethod -Method Post -Uri "https://api.trello.com/1/cards?$APIKEY" -Form $FORM