Using uploaded files as attachment

General
1

I am trying to send uploaded files as attachment in my email, but I always received this files not exist error kindly help

module.exports = {
  async afterCreate(event) {
    const { result } = event;
    console.log(result);
    const filePath = result.signature.url;
    console.log("the file path is " + filePath);
    if (fs.existsSync(filePath)) {
      console.log("file exist");
    } else {
      console.log("file not exist");
    }

    attachment = fs.readFileSync(filePath).toString("base64");

    try {
      console.log(result);
      const value = await strapi.plugins["email"].services.email.send({
        to: "tluangahauhnar@gmail.com",
        from: "webadmin@mzu.edu.in",
        subject: "Submission of Application of MZU Registration",
        text: "You have  sucessfully submitted your application for Mizoram University Registration",
        attachments: [
          {
            filename: "signature",
            content: attachment,
            type: "application/pdf",
            disposition: "attachment",
          },
        ],
      });
      console.log("the email has been sent");
      console.log(value);
    } catch (err) {
      console.log(err);
    }
  },
};