You can only view NFTs based on Klaytn and Base Chain in Iskra Wallet.
Make sure that you have selected Klaytn or Base when sending your NFT. Please visit block explorer services below to view NFTs that can't be inquired. It may take some time depending on the network condition.
Base Chain : https://basescan.org/
Please submit a ticket through the Help Center if you are not able to check a transaction made or if you have other inquiries.