Add NFT to the collection

Hello dear forum users. I created the erc-721 collection, 144 items were added at once, but now I need to add 2 more nft to the same collection, I put it up for sale at the foundation. Can you suggest how I can do this? Thanks for your support.

Gm! Typically platforms will treat each new contract as a new collection. Minting tokens to the same collection will allow tokens to appear together.