When the contract has been created and NFTs start to populate your Opensea page after being minted, some of them will show "content not available", to force opensea to pull the image from the metadata you need refresh it on every NFT that shows this message.

Also when you do the REVEAL, it´s not automatic, Opensea has the metadata of the hidden image so you need to do the same in order to see the final NFT.

To refresh the metadata you just need to click on this button:

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