AWS Lambda read PDF from local directory | Nodejs - node.js

Question

I am trying to send a GMAIL message containing a PDF file (I am using nodemailer for this).
The error is generated when reading the PDF file with path (native dependency of node); The error that returns is a 500 Server Error.
module.exports.get_boletin = async (event) => {
const { wrapedSendMail } = require('./helpers/sendPromise');
const path = require('path');
const { email } = JSON.parse(event.body);
if(!email) {
return {
statusCode: 400,
body: JSON.stringify({
ok: false,
detail: 'Email is required'
})
};
}
const mailOptions = {
to: email,
from: "example#gmail.com",
subject: `any_msg`,
attachments: [
{
filename: `file.pdf`,
path: path.join(__dirname, `file.pdf`),
contentType: 'application/pdf',
},
],
}
const _send = await wrapedSendMail(mailOptions)
if(_send){
return {
statusCode: 200,
body: JSON.stringify({
ok: true,
detail: 'Mensaje enviado correctamente.',
event: JSON.parse(event.body)
})
}
} else {
return {
statusCode: 500,
body: JSON.stringify({
ok: false,
detail: 'Error al enviar el mensaje.',
event: JSON.parse(event.body)
})
}
}
};
This piece of code is the one that generates the error
attachments: [
{
filename: `file.pdf`,
path: path.join(__dirname, `file.pdf`),
contentType: 'application/pdf',
},
]
I tried locally and in an EC2 instance, this works normally the error is only generated in Lambda