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How do I fix this?
I can’t select any blockchain on the mainnet, I tried switching it in coinbase wallet and rainbow wallet but with no results. I also tried on desktop but every time the collection tries to upload on base sepolia testnet. 
Is it mandatory to go through the testnet?

Based NFT artist building /thekey /nfthreat-art // Portfolio and Hypersub: https://linktr.ee/nfthreat // No financial advices

still not working on mobile, maybe i’m doing something wrong I don’t know

you shouldn't see this issue anymore - thanks for alerting!