Typically people will store it somewhere (S3 or otherwise) and generate an IPFS hash of the file and write the hash to the NFT. Doge is just a Bitcoin fork and

Typically people will store it somewhere (S3 or otherwise) and generate an IPFS hash of the file and write the hash to the NFT. Doge is just a Bitcoin fork and can't store data any more easily than Ethereum. File storage protocols exist such as Sia and Filecoin, that are more appropriate for decentralized storage.