curl --request POST \
  --url https://app2.freyavoice.ai/api/v2/call/{callId}/recording \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form recording='@example-file'

{
  "success": true,
  "data": {
    "message": "<string>",
    "result": {
      "callId": "<string>",
      "key": "<string>",
      "size": 123,
      "contentType": "<string>"
    }
  }
}