For this, we don’t have to use sendTemplatedEmail. Just the function send with
template_id: "d-d87cb96227e641e9a8fcda2c0b11edc7",
dynamic_template_data: {
user: order.user,
order: order
}
(in my case)
PD: We can use the attachment camp to send files ( Sending Email with Attachments using SendGrid and Node.js - Twilio)