on open sea nft themselves are not displayed, there are no metadata or pictures themselves

I have a problem I create a contract with nft in remix ide at this stage everything works, but on open sea nft themselves are not displayed, there are no metadata or pictures themselves, although the contract sees them

I guess that we will need more info, like what is the contract address, on what chain, what is the opensea link, how does metadata look like, how does a picture url look like.