All NFTs need a place to store their metadata. One of the most common providers is Arweave, a public blockchain built for permanent storage.
A key concept to understand when managing NFT Metadata are URIs (Uniform Resource Indentifier). They are like tradicional URL Links, only that in this case they do not point to a Web address but to content stored on the Arweave Blockchain, like NFT Metadata.
Think of the URI as the container where all the NFT information/metadata is permanently stored.
So every time you create an NFT on Hedera, you'll need to add the URI link into its Metadata field. This link will be used to retrieve all the NFT information in wallets, marketplaces, or any other DApp loading the NFT.
To upload metadata to Arweave, you'll need to pay an upfront fee of $0.039 per MB of data. This one-time fee is paid in HBAR and ensures your data is permanently stored for a minimum of 200 years.