API - Sample Add Attachment via Powershell?

Update: As noted Powershell 7 is required for -form support. 

I was able to get things to work.  Posting here my notes to help any future people searching for clues.   

Adding to the ticket.

$file = @{
    "file[attachable_type]" = "Incident"
    "file[attachable_id]" = "123456"
    "file[attachment]" = (get-item -path "C:\temp\Test.txt")
}

$uri = "https://api.samanage.com/attachments.json"

Invoke-RestMethod -Uri $uri -form $file -ContentType 'multipart/form-data' -ResponseHeadersVariable ResponseHeader -Method Post -WebSession $session

Adding to a comment in the ticket.

$file = @{
    "file[attachable_type]" = "Comment"
    "file[attachable_id]" = "123456"
    "file[attachment]" = (get-item -path "C:\temp\Test.txt")
}

$uri = "https://api.samanage.com/attachments.json"

Invoke-RestMethod -Uri $uri -form $file -ContentType 'multipart/form-data' -ResponseHeadersVariable ResponseHeader -Method Post -WebSession $session

Also found that when using the curl example on Windows you need to use double quotes not the single quote as shown in the API doc. 

Note: You must be using PowerShell 7.x+ for this as the Invoke-RestMethod from previous versions does not support the -Form parameter.

Note: You must be using PowerShell 7.x+ for this as the Invoke-RestMethod from previous versions does not support the -Form parameter.

Yes that is correct.  Thanks for noticing that.