there has been changes in from infura IPFS, public client address has been deprecated. You have to created DEDICATED GATEWAY SUBDOMAIN from INFURA IPFS managment key section replace the url in saveToIPFS function like this const fileUrl = `https://ac12644.infura-ipfs.io/ipfs/${added.path}`;

I have also upated the repo and gist. Thank you for mentioning error :)