file writing function working on localhost but not on azure - node.js

Question

I have a function in my node js app that takes information and creates a csv file, then uploads it to the server. The code is below:
//check user has enough credits
if (req.user.credits >= 5) {
//check if user selected a recipient, and handle
let { name, address, state, country, city, postcode, message, note_name } = "";
let createRecipient = true;
if (req.body.recipient != "none") {
createRecipient = false
const recipient = await userController.getRecipientById(req.body.recipient);
name = recipient.name
address = recipient.address
state = recipient.state
country = recipient.country
city = recipient.city
postcode = recipient.postcode
message = req.body.message
note_name = req.body.note_name
} else {
name = req.body.name
address = req.body.address
state = req.body.state
country = req.body.country
city = req.body.city
postcode = req.body.postcode
message = req.body.message
note_name = req.body.note_name
}
const path = 'uploads\\notes_files\\';
const filename = path + randomUUID() + '.csv';
//first, save recipent to database
console.log(createRecipient + req.body.save_recipient)
if (createRecipient && req.body.save_recipient == 'on') {
db.query('INSERT into RECIPIENTS SET ?', {user_id: req.user.id, name: name, address: address, state: state, country: country, city: city, postcode: postcode }, function(err) {
if (err) throw err
});
}
//next, create a CSV file
const csvWriter = createCsvWriter({
path: filename,
header: [
{id: 'name', title: 'Name'},
{id: 'address', title: 'Address'},
{id: 'state', title: 'State'},
{id: 'country', title: 'Country'},
{id: 'city', title: 'City'},
{id: 'postcode', title: 'Postcode'},
{id: 'message', title: 'Message'}
]
});
const records = [
{name: name, address: address, state: state, country: country, city: city, postcode: postcode, message: message}
];
await csvWriter.writeRecords(records)
.then(() => {
let note_id;
db.query(`INSERT INTO notes SET ?`, {filename: 'temp', user_id: req.user.id, note_status: 'pending', note_name: note_name }, function(err, result) {
if (err) throw err;
// rename file to format 'note*id*_user*id*
note_id = result.insertId
const new_filename = 'note' + note_id + '_user' + req.user.id + '.csv'
//update in DB
db.query('UPDATE notes SET filename = ? WHERE note_id = ?', [ new_filename, note_id ], function(err) {
if (err) throw err;
//move to uploads folder
fs.rename(filename, path + new_filename, function(err) {
if (err) {
console.log(err);
res.send('There was a problem uploading your file. Please try again.');
}
//create notification before ending function
userController.createNotification(req.user.id, "New Note", "New note has been sent to our team for approval.");
res.redirect('/');
});
});
});
})
} else {
res.status(400).send('Not enough credits.')
}
}
this works fine on localhost, but when i deploy the app on an azure web app, i get this error in the azure logs:
2022-06-07T06:33:57.961918438Z node:internal/process/promises:246
2022-06-07T06:33:57.961969838Z triggerUncaughtException(err, true /* fromPromise */);
2022-06-07T06:33:57.961997638Z ^
2022-06-07T06:33:57.962012639Z
2022-06-07T06:33:57.962016639Z [Error: EINVAL: invalid argument, open 'uploads\notes_files\1d624787-2d06-41d7-909e-bb6283ea0efb.csv'] {
2022-06-07T06:33:57.962020839Z errno: -22,
2022-06-07T06:33:57.962024839Z code: 'EINVAL',
2022-06-07T06:33:57.962028639Z syscall: 'open',
2022-06-07T06:33:57.962102239Z path: 'uploads\\notes_files\\1d624787-2d06-41d7-909e-bb6283ea0efb.csv'
2022-06-07T06:33:57.962110639Z }
Any clue as to why this is working on localhost but not on azure?