我需要帮助从我的gmail收件箱中保存带有特定主题行“发票”的pdf附件。
我已经在网上搜索了代码，并得出以下结论，但在修改代码时遇到了挑战。理想情况下，th代码应该能够解析从任何发件人下载附件到gdrive的特定文件夹中查找“发票”一词的电子邮件主题。
我将感谢任何帮助修改代码。

function GmailToDrive(){
  var query = '';
  //filename:jpg OR filename:tif OR filename:gif OR fileName:png OR filename:bmp OR filename:svg'; //'after:'+formattedDate+
  for(var i in fileTypesToExtract){
    query += (query === '' ?('filename:'+fileTypesToExtract[i]) : (' OR filename:'+fileTypesToExtract[i]));
  }

  //ADD the only email adress you want to check + EDIT : only last 24h emails
  query = 'in:inbox has:nouserlabels ' + query + ' AND from:sender@sender AND newer_than:1d';

  var threads = GmailApp.search(query);
  var label = getGmailLabel_(labelName);
  var parentFolder;
  if(threads.length > 0){
    parentFolder = getFolder_(folderName);
  }
  var root = DriveApp.getRootFolder();
  for(var i in threads){
    var mesgs = threads[i].getMessages();
    for(var j in mesgs){

      //ADD: check if the mail is unread:
      if (mesgs[j].isUnread()) {

        var attachments = mesgs[j].getAttachments();
        for(var k in attachments){
          var attachment = attachments[k];
          var isDefinedType = checkIfDefinedType_(attachment);
          if(!isDefinedType) continue;
            var attachmentBlob = attachment.copyBlob();
            var file = DriveApp.createFile(attachmentBlob);
            parentFolder.addFile(file);
            root.removeFile(file);
          }
        }

      } // close if unread
    } // close for msg loop

    //ADD: Set thread (all mail included) as read
    GmailApp.markThreadRead(threads[i]);

    threads[i].addLabel(label);
  }
}