Convert it into a single Zip file and upload that. to unzip the folder use the code down bellow

import zipfile as zf
files = zf.ZipFile("ZippedFolder.zip", 'r')
files.extractall('directory to extract')
files.close()

However, sometimes you may need to download several files from notebook. There are several ways to do this but the easiest way is to zip a directory and download the zip file:

import shutil
shutil.make_archive(output_filename_dont_add_.zip, 'zip', directory_to_download)