There was a project called freenet that attempted a decentralized network to store files there, im not sure if it died or not but that may make more sense that using a blockchain.
Freenet is not died. It don't use the blockchain, it is a totally different approach more similar to a decentralized caching. It is very cool and there are a lot of plugins take a look at this simple guide
http://freesocial.draketo.de/index_en.htmlThis is tutorial is designed for anyone who wants to use Freenet primarily for anonymous and censorship-resistant social networking and truly private email.