API - Sample Add Attachment via Powershell?

Question

I'm very new to Invoke-RestMethod and have been successful at pulling the data that I want. Thanks to a few posts I've seen here. 
 But One challenge that seems to stump me is how to add an attachment to an incident via powershell. I see the api docs have a curl example. I have not seen any PS examples and my poor brain is unable to convert the syntax of curl to Invoke-RestMethod.

ICJN · Accepted Answer

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:	emp\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:	emp\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.

API - Sample Add Attachment via Powershell?

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