Save struct with nested mappin

Solidity Programming
#1

How in gods name do you save a struct with nested mapping?
struct ALBUM{
uint256 id;
string name;
address creator;
mapping(uint256=>NFT) nft;
}

  ALBUMID = ALBUMID.add(1);
  ALBUM storage save = idToAlbum[ALBUMID];
  save.id = ALBUMID;
  save.name = name;
  save.nft = ???; ///errror, error, error no matter what i try
  save.creator = msg.sender;
#2

I don’t know this, but I’m thinking that you could have a mapping of mappings outside of this struct that should work