I am bit confused regarding NFT implementation usng ERC-1155 because of newbie in NFT, by defination, there can be one instance of one NFT, there is one uuid per artwork. But in ERC-1155, I can set X amount per ID, so

  1. This NFT thing, having one instance or amount per UUID will be managed on App side or there can be multiple instances of one uuid?
  2. If I mint a token by setting token ID as uuid and path of actual image in metadata file. What if that image file replaced as that is not on Blockchain?
  3. How can I setup commission while minting NFT using ERC-1155, or it is again to be managed on app side?
  4. Is there a way if I want to prevent sale/purchase outside my app?

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