We currently allow our users to upload images up to 10 MB.
We support PNG, gif, jpeg, pdf, ogg, mp3, mp4.
We recommend our users to use a 1:1 RATIO for their images. The reason for that is that squares work best on all ERC-721 wallets. Ultimately, the point of a NFT is that is is interoperable and can be displayed on different dapps and wallets.