os.chdir returns No such file or directory: 'None'

How come that these lines of code creates a folder, but returns an error output?

key_ = "Test"
new_folder = os.makedirs(str(key_)+str(datetime.datetime.fromtimestamp(ts).strftime('%Y-%m-%d %H:%M')))
os.chdir(str(new_folder))

The error I'm getting is

line 457, in download_url
os.chdir(str(new_folder))
FileNotFoundError: [Errno 2] No such file or directory: 'None'

source https://stackoverflow.com/questions/73114307/os-chdir-returns-no-such-file-or-directory-none

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