通过nodemailer通过sendgrid api发送时，PDF无法读取

const nodemailer = require('nodemailer');
const sgMail = require('@sendgrid/mail');

// 使用SendGrid提供的API密钥进行身份验证
sgMail.setApiKey('YOUR_SENDGRID_API_KEY');

// 创建一个nodemailer传输对象
const transporter = nodemailer.createTransport({
  service: 'SendGrid',
  auth: {
    user: 'YOUR_SENDGRID_USERNAME',
    pass: 'YOUR_SENDGRID_PASSWORD'
  }
});

// 定义邮件选项
const mailOptions = {
  from: 'sender@example.com',
  to: 'recipient@example.com',
  subject: 'Email with PDF attachment',
  text: 'Please find the attached PDF file.',
  attachments: [
    {
      filename: 'example.pdf',
      path: '/path/to/example.pdf' // 请确保路径正确且文件可读取
    }
  ]
};

// 发送邮件
transporter.sendMail(mailOptions, (error, info) => {
  if (error) {
    console.log(error);
  } else {
    console.log('Email sent: ' + info.response);
  }
});