How to link arweave metadata to ERC721 contract?

[frangio]

I'm not familiar with Arweave so I can't answer about that. For IPFS there exists the possibility to upload a directory rather than a file, so when you request .../1 you get the file called "1" inside the directory, and this can be used for NFT ids. See:

Why doesn't OpenZeppelin ERC721 contain setTokenURI?

Yes, we think most people should try to avoid setTokenURI if possible for their use case. If you use IFPS, your baseURI wouldn’t be gateway.pinata.cloud, it would be the URI to an IPFS directory. For example, I just uploaded a directory to Pinata at https://gateway.pinata.cloud/ipfs/QmcP9hxrnC1T5ATPmq2saFeAM1ypFX9BnAswCdHB9JCjLA/. I can now create an ERC721 with that URL as its baseURI (or I could use a native ipfs:// protocol URI), and mint token IDs 1 and 2. The concatenated URI for token …

If there is nothing like this for Arweave then this pattern is not possible and you would have to use ERC721URIStorage to set a different tokenUri for each id.