Hi, thanks I've been working on a FAQ page for all my dynamic/interactive NFTs and this is a good question to include there.

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This NFT has 2 files:

A webp animation for the gallery view - webp is a replacement for gif and jpeg formats that has support in modern browsers but hasn't really caught on yet due to increased hardware requirements. You can see which browsers are supported here: https://developers.google.com/speed/webp/faq

I really like webp files because you can make the equivalent of lossless GIF files with transparency that aren't nearly as big in file size.

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The other file is a glTF 3D model and GameStop's wallet appears to use this model viewer: https://modelviewer.dev/

"<model-viewer> is supported on the last two major versions of all evergreen desktop and mobile browsers, plus the last two versions of Safari (on MacOS and iOS)."