Modify Twilio sample code to attach voicemail recoding and send by email - node.js

Question

The following post from Twilio explains how to write and implement a function for sending the link of a recorded message to email.
https://www.twilio.com/blog/forward-voicemail-recordings-to-email
I want to attach to the voicemail recording rather than just send the link. Here is my attempt at modifying their code. Unfortunately it's causing a 500 error. I'm not very experience with NodeJS so perhaps you can help.
Dependencies for SendGrid and FS are included and this function worked perfectly until I modified it with FS, pathToAttachment, attachment variables and the attachments array.
//Initialize SendGrid Mail Client
const sgMail = require('#sendgrid/mail');
//FileSystem
const fs = require("fs");
// Define Handler function required for all Twilio Functions
exports.handler = function(context, event, callback) {
pathToAttachment = `${event.RecordingUrl}`;
attachment = fs.readFileSync(pathToAttachment).toString("base64");
// Build SG mail request
sgMail.setApiKey(context.SENDGRID_API_SECRET);
// Define message params
const msg = {
to: context.TO_EMAIL_ADDRESS,
from: context.FROM_EMAIL_ADDRESS,
fromname: 'Voicemail',
text: `URL is: ${event.RecordingUrl}`,
subject: `${event.From} (${event.country} / ${event.lang})`,
attachments: [
{
content: attachment,
filename: "Voicemail.wav",
disposition: "attachment"
}
]
};
// Send message
sgMail.send(msg)
.then(response => {
console.log("Neat.")
callback();
})
.catch(err => {
console.log("Not neat.")
callback(err);
});
};

Answer 1

This is how you modify the code from the Twilio blog:
Forward Voicemail Recordings to Email w/ Studio, Functions, & SendGrid
https://www.twilio.com/blog/forward-voicemail-recordings-to-email
.. to attach the email recording instead of link to it and how to add a from name as well as a from email address.
const request = require('request');
const sgMail = require('#sendgrid/mail');
exports.handler = function(context, event, callback) {
const fileUrl = event.RecordingUrl;
// Build SG mail request
sgMail.setApiKey(context.SENDGRID_API_SECRET);
request.get({ uri: fileUrl, encoding: null }, (error, response, body) => {
const msg = {
to: context.TO_EMAIL_ADDRESS,
from: {
"email": context.FROM_EMAIL_ADDRESS,
"name": `My company`
},
text: `Attached voicemail from ${event.From}.`,
subject: `${event.From}`,
attachments: [
{
content: body.toString('base64'),
filename: `MyRecording.wav`,
type: response.headers['content-type']
}
]
};
// Send message
sgMail.send(msg)
.then(response => {
console.log("Neat.")
callback();
})
.catch(err => {
console.log("Not neat.")
callback(err);
});
});
};
This is how you modify the code from