Save attachments from last mails - google-apps-script

Question

I need saving the attachments im mails from one sender with file format 'gz' to folder GmailToDrive in Google-drive with replacement old file
Here Apps script saving attachments from last mail I get answer with script, but something is wrong.
I think, this - query = 'in:inbox has:nouserlabels ' + query + ' AND from:entrepot#fmlogistic.fr AND older_than:4h';
Can you help me? thank you very much!
// GLOBALS
//Array of file extension which you would like to extract to Drive
var fileTypesToExtract = ['gz'];
//Name of the folder in google drive i which files will be put
var folderName = 'GmailToDrive';
//Name of the label which will be applied after processing the mail message
var labelName = 'GmailToDrive';
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:entrepot#fmlogistic.fr AND older_than:4h';
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);
}

Answer 1

As per documentation:
older_than can be used for messages older than a time period using d (day), m (month), and y (year)
So, 4h won't work.