javascript - 如何在js中将附件添加到gmail api

Question

我正在尝试在 google api 中添加几个图像附件，我无法找到任何解决方案，尽管我可以在没有它的情况下发送邮件，任何人都可以帮助添加附件。

const encodedMail = btoa([
  `From: ${guest_email}\r\n`,
  `To: ${toHotel}\r\n`,
  `Subject: ${fullname} Sent Mail\r\n\r\n`,
  `Hello There\n\n I have Just Mailed, Please find my details\n\n Name: ${fullname}\n 
     Phone: ${phone}\n `
].join('')).replace(/\+/g, '-').replace(/\//g, '_');

const response = await fetch(url, {
  method: 'POST',
  mode: 'cors',
  cache: 'no-cache',
  credentials: 'same-origin',
  headers: {
    'Authorization': 'Bearer ' + accessToken,
    'Content-Type': 'application/json'
  },
  redirect: 'follow',
  referrerPolicy: 'no-referrer',
  body: JSON.stringify({
    'raw': encodedMail
  })
});

if (response) {
  console.log(response)
}

帮助将不胜感激。