Adding a new NFT to an existing collection does not work

[jkdizajn]

Hello,
when I try to add a copy of the NFT to an already created collection, the system will not allow it.
Has anyone encountered this problem?

Link to the video from the preview https://gateway.pinata.cloud/ipfs/QmQyuKvK9HGYCYPwYQvyxWXXKnZSobcs2JAR91kQ6oJfGk

[vikiival]

Small recap:
@jkdizajn created a single 1-by-1 NFT and his request is possibility to set max attribute ( create sort of copies :))

Update for #278