My NFTs on Opensea

Step 1 : Connect your wallet on www.opensea.io.

Step 2 : Check that your wallet is set to Polygon network

Step 3 : Go to your profile

Step 4 : Unfold the “more” menu -> choose “hidden”

Step 5 : roll over your NFT: a blu menu appears at the bottom of the NFT: click on the 3 vertical dots and select "unhide".

Step 6: sign the authorisation to unhide in your wallet .

Your NFT now appears in the "collected" tab of your profile.