How to see the image file within a NFT

I've recently followed the NFT minting tutorial (https://ethereum.org/en/developers/tutorials/how-to-view-nft-in-metamask), the whole 3 steps. I've successfuly minted an NFT to a wallet of mine in Ropsten Network, after uploading a image to Pinata, as the tutorial explains.

Yet, although I have the NFT on my wallet, I can't manage to see the corresponding image file. Of course, since I minted it, I know that this NFT corresponds to the image I have in Pinata. But in case I send the NFT to anyone else, how does that person accesses the image file? I've learned that there is a platform called Rainbow.me that fetches and displays the images associated with the NFTs of a certain wallet. But it seems to be working only for Ethereum Mainnet.

Thank you in advance