how to send attachments to node mailer file not found

1function sendEmail(userEmail, htmlString, requestSnap, FIREBASE_WEB) {
2
3fileName = "test.pdf";
4folderName = "./" + uuid.v4();
5mkdirp(folderName, function (err) {
6    if (err) console.error(err)
7    else console.log(folderName + ' folder created!')
8});
9
10pdf.create(htmlString + userEmail, options).toFile(folderName + '/' + fileName, function (err, res) { // if the file doesnt exist it will be created
11    if (err) return console.log(err);
12    console.log(res);
13
14    var transporter = nodemailer.createTransport(smtpTransport({
15        service: 'Gmail',
16        auth: {
17            user: '...',
18            pass: '...'
19        }
20    }));
21    console.log("\nPATH " + folderName + "/" + fileName);
22
23    var mailOptions = {
24        from: 'marija.lukaroska.cw@gmail.com',
25        to: userEmail,
26        subject: 'So mail vo pdf-ot',
27        text: 'Hellow',
28        attachments: [{
29            path: folderName + "/" + fileName
30        }]
31    };
32
33    transporter.sendMail(mailOptions, function (error, info) {
34        if (error) {
35            console.log("ERROR kkkk " + error);
36        } else {
37            console.log('Email sent: ' + info.response);
38            console.log("REQUEST SNAP " + JSON.stringify(requestSnap));
39        }
40
41        deleteFolderRecursive(folderName);
42    });
43});
44}