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Can anyone please give me any link or docs where I can find more about Substrate Files decentralized storage?

I have gone through this link: https://github.com/polkadot-js/apps/pull/6106

Is there any other material to explore more about it?

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Looks like there was an announcement by the Crust team when this feature came out:

Polkadot Files module is now LIVE for all Polkadot ecosystem users, including relay and parachain users @Polkadot 📢📢📢

✅File storage

✅NFT metadata pinning

✅Website hosting

✅DECENTRALIZED through #CrustNetwork and #IPFS!

That link that you shared pretty much has all the information.

For example, the README states:

Substrate Files is a decentralized storage module which allows substrate-based chains(including Polkadot/Kusama/Crust/Acala/Clover/Moonbeam/Astar/Phala/...) users upload their files to IPFS W3Auth Gateway and decentralized pin their files on Crust Network by using the standard IPFS W3Auth Pinning Service. This module is a 100% IPFS compatible file storage module, users can pin NFT files, host DApps or store on-chain data in totally DECENTRALIZED way(guaranteed by Crust protocol). Also, the Pinning Service is compatible with several Platforms like Ethereum, Polygon, Solana and Near, and funded by Decentralized Cloud Foundation. So currently, Substrate Files is FREE for all the substrate-based chains!

You can read about the particulars by reading the code and the Crust technology that was used e.g. IPFS W3Auth Gateway

If you're not familiar with how Crust works, start here:

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