What is needed as a payload for the `userfile0` parameter?

The following is a curl example for uploadTradeDocument with the client ID, developer key, and trade ID redacted:

The following is a curl example for uploadTradeDocument with the client ID, developer key, and trade ID redacted:

curl --request POST "https://api-sandboxdash.norcapsecurities.com/tapiv3/index.php/v3/uploadTradeDocument" -F clientID=[ ] -F developerAPIKey=[ ] -F tradeId=[ ] -F documentTitle=documentTitle0=testdocument -F file_name=filename0=test.pdf -F createdIpAddress=10.0.0.59 -F userfile0=@/Users/johnsmith/Downloads/Example.pdf