Create new file in a folder with Apps Script using Google Advanced Drive service

Question

There are four ways to create a new file:

• DocsList - Shown as DocsList in the Main List. Built in to Apps Script.
• DriveApp - Shown as

Answer 1

var searchthreads = GmailApp.search('in:inbox AND after:2020/11/30 AND has:attachment');//"in:all -in:trash category:social older_than:15d
   Logger.log("GMAIL thread 0:"+ searchthreads[0].getId());
   Logger.log("GMAIL thread 1:"+ searchthreads[1].getId());
   Logger.log("GMAIL thread 2:"+ searchthreads[2].getId());
   Logger.log("Active User: " + me);
   Logger.log("Search Thread: " + searchthreads.length);
   Logger.log("Gmail lenght" + gmailthread.length);
   //Logger.log("Gmail lenght" + gmailMessages.length);
   for (var i in searchthreads){
   
   var messageCOunt = searchthreads[i].getMessageCount();
   Logger.log("messageCOunt :"  + messageCOunt);
   var messages =  searchthreads[i].getMessages();
   for (var m in messages){
       var messagesender = messages[m].getFrom();
       var messageDate = messages[m].getDate();
       var messageReplyTo = messages[m].getReplyTo();
       var messagesubject = messages[m].getSubject();
       var messagebody = messages[m].getSubject();
       var messagephoneNo = messages[m].getSubject();
       //messages[m].isInInbox();
       var messageid = messages[m].getId();
       var messageplainbody = messages[m].getSubject();//messages[0].getPlainBody();  
       var EmailStatus ='N';
       var ApptStatus = "CVReceived";// Tracking till candidate offer and payout
       var messageattachement = messages[m].getAttachments();
     //var png=UrlFetchApp.fetch(messageattachement).getBlob();
     //https://drive.google.com/drive/folders/1RY4i6FwUvfy5OxrJ1pZTxJAOxjFFXbhz?usp=sharing
     var folder = DriveApp.getFolderById("1RY4i6FwUvfy5OxrJ1pZTxJAOxjFFXbhz");
    // DriveApp.getFolderById("1RY4i6FwUvfy5OxrJ1pZTxJAOxjFFXbhz").createFile(png);
     //DriveApp.createFile();
     
     for (var k in messageattachement){
       var filename = messageattachement[k].getName(); 
       var filesize = messageattachement[k].getSize();
       var filecontent = messageattachement[k].getContentType();
       var fileBlob = messageattachement[k].getAs(filecontent);
       var filecpblob = messageattachement[k].copyBlob();
       //folder.createFile(filename, messageattachement);
      
       
    
      var file = {
    title: filename,
    "parents": [{'id':folder.getId()}],
    mimeType: filecontent
  };
  file = Drive.Files.insert(file, filecpblob);
         
  //DataStudioApp  
  Logger.log('ID: %s, File size (bytes): %s', file.id, file.fileSize);
       //folder.createFile(filecpblob);
      }
       var processeddate = new Date();