curl --request GET \
  --url https://api.messages.dev/v1/files \
  --header 'Authorization: Bearer <token>'

{
  "error": {
    "type": "invalid_request_error",
    "code": "missing_required_parameter",
    "message": "The 'from' query parameter is required.",
    "param": "from"
  },
  "request_id": "req_abc123"
}