The MCC standard names a collection "collection NFT by default"
Following metaplex's new MCC standard, naming a collection is not as simple as putting the collection name in the NFT's metadata anymore. Instead, the new standard migrates the NFT details on-chain.
The tool that metaplex provides (https://collections.metaplex.com/) can rename a collection but it can only do so once the NFT is minted. This brings me back to my main question: How do I change the name of a solana collection prior to minting?
There is something you need to know regarding MCC. When you run upload command a NFT without metadata will be minted to the wallet that you provide as authority (-k parameter), this empty NFT is the default collection NFT and will act as portrait of all the unminted NFTs inside ur collection. The reason that you see Collection NFT as portrait is because that NFT has no metadata. Also all unminted NFTs are attached to this collection unless you use set_collection given as -m parameter a new collection id (another created collection NFT), but this can only be done if your CandyMachine has 0 minted items.
In order to solve the Collection NFT you just have to add metadata to the minted default collection NFT. If you are on mainnet-beta I recommend you to use this website, you can also use metaboss (ut you will have to upload ur metadata to an storage before).
You can see what is the collection NFT that is attached to ur CandyMachine using the show command that will output the following info about the collection NFT (and more info about the CM): Collection mint: Gfe...6q9, that Collection mint is the NFT that is attached to ur CM as collection if its metadata is empty you just have to update it so every minted NFT will be attached to a non-empty NFT as collection.
