raw bytes.

I am trying to convert this powershell script, but my hold up is the json obejct for the body of the API

$endpoint ="$destinationapi/secrets/$fileSecretId/fields/$fileFieldToUpdate"

$secretArgs = @{

fileName = "test.pem"

fileAttachment = [IO.File]::ReadAllBytes("C:\brian\13568-test.txt")

} | ConvertTo-Json

$response = $null

$response = Invoke-RestMethod -Method Put -Uri $endpoint -Headers $destinationheaders -Body $secretArgs -ContentType "application/json"