I’m trying to sort my files using this code, and there are no errors that are being produced however my files are not being sorted. The correct files are being created, but for some reason the files won’t move.

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I was following a video tutorial on youtube and reproduced the code exactly how it is, but am unsure why it’s not working. Here’s a link to the video.
https://www.youtube.com/watch?v=gs0FNQR0njI&list=PLUaB-1hjhk8FE_XZ87vPPSfHqb6OcM0cF&index=52