OpenSea was among the first to provide a robust way to view NFTs on testnets, and to preview your assets & metadata, but since then a lot has changed.
Over time, testnets have became much less frequently used — lower cost chains emerged that made dedicated testnets less popular for testing, blockchain explorer tools started supporting basic NFT usecases across main/testnets, and new tools like Drops (and many others) make previewing offchain simpler.
With OS2 launch, we have discontinued dedicated environment for testnets.
For users of Creator Studio, we've added additional features to allow you to edit & preview your NFTs prior to publishing, and saving in "Draft" mode.
As always, keep letting us know what will make creativity & building in the space easier on X, or through Support.
Happy building ⛵️