我想将 pdf 保存到 Cloudant。使用下面的代码，在 Cloudant 中打开附件时出现错误。 “处理此文件时遇到错误” 我可以将假字符串数据放在“._attachments[name].data”字段中，它会保存。

Cloudant 文档说数据内容需要采用 base64 格式，这就是我正在尝试的。 Cloudant 说“必须使用 BASE64 表示提供内容”

 function saveFile() {
      var doc = {};
      var blob = null;
      //fileName is from the input field model data
      var url = fileName;
    
  fetch(url)
    .then((r) => r.blob())
    .then((b) => {
      blob = b;
      return getBase64(blob);
    })
    .then((blob) => {
      console.log(blob);
      let name = url._rawValue.name;

      doc._id = "testing::" + new Date().getTime();
      doc.type = "testing attachment";

      doc._attachments = {};
      doc._attachments[name] = {};
      doc._attachments[name].content_type = "application/pdf";
      doc._attachments[name].data = blob.split(",")[1];
      console.log("doc: ", doc);
    })
    .then(() => {
      api({
        method: "POST",
        url: "/webdata",
        auth: {
          username: process.env.CLOUDANT_USERNAME,
          password: process.env.CLOUDANT_PASSWORD,
        },
        data: doc,
      })
        .then((response) => {
          console.log("result: ", response);

          alert("Test has been submitted!");
        })
        .catch((e) => {
          console.log("e: ", e);
          alert(e);
        });
      console.log("finished send test");
    });
}
function getBase64(file) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => resolve(reader.result);
    reader.onerror = (error) => reject(error);
  });
}

有什么想法吗？ 谢谢