Can you help me please?
You are trying to verify a contract which import from NPM so you must first flatten it
How do I get this to work do you have any tips? Do you have information for me
You can use any flattener on remix
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Can I take any smart contract or only the one I created the nfts with?
Of course you must use the contract you are trying to verify
But I have already mined nfts and also a smart contract on polyscan but I can't verify it, does the smart contract you want to verify have to be the same one you created?
thank you for helping me the flattening has worked, the error is gone.
but now another error has come, can you help me there too...?
Hi, welcome to the community! 
I think you can have a look at this tutorial:
And for the next time, please search in the forum at first, thanks!