Google App Script: Upload Multiple Files to Google Drive (Code.gs)

Google_App_Script_Upload_Multi_Files_To_GoogleDrive_Code.gs

function doGet() {
	return HtmlService.createHtmlOutputFromFile('Form').setSandboxMode(
			HtmlService.SandboxMode.IFRAME);
}

function createFolder(parentFolderId, folderName) {
	try {
		var parentFolder = DriveApp.getFolderById(parentFolderId);
		var folders = parentFolder.getFoldersByName(folderName);
		var folder;
		if (folders.hasNext()) {
			folder = folders.next();
		} else {
			folder = parentFolder.createFolder(folderName);
		}
		return {
			'folderId' : folder.getId()
		}
	} catch (e) {
		return {
			'error' : e.toString()
		}
	}
}

function uploadFile(base64Data, fileName, folderId) {
	try {
		var splitBase = base64Data.split(','), type = splitBase[0].split(';')[0]
				.replace('data:', '');
		var byteCharacters = Utilities.base64Decode(splitBase[1]);
		var ss = Utilities.newBlob(byteCharacters, type);
		ss.setName(fileName);

		var folder = DriveApp.getFolderById(folderId);
		var files = folder.getFilesByName(fileName);
		var file;
		while (files.hasNext()) {
			// delete existing files with the same name.
			file = files.next();
			folder.removeFile(file);
		}
		file = folder.createFile(ss);
		return {
			'folderId' : folderId,
			'fileName' : file.getName()
		};
	} catch (e) {
		return {
			'error' : e.toString()
		};
	}
}

I was looking for a script which allows a user to upload multiple files and found this. It's exactly what I'm looking for, but it's not working for me. The html form correctly selects the files and uploads them, but my theory is the folders (based on username and email) are not being created properly.
I wonder if something's changed with Google Drive recently which prevents this script from working.
Are you able to test it again and confirm that it still works?

Thanks in advance,
Adit

Buenos dias realizando pruebas con el código me carga la información pero se está perdiendo en el momento de almacenarla, ¿algún cambio que se deba realizar? , agradecería su ayuda

I run this script and it upload only 35 files, no more. It was Uncaught.