do I have to open it on the 1sat site to see it?

This way！
Because this HTML art collection was not created by or supported by ZoideNFT.

https://app.treechat.com/quest/4660b32e-9373-48ce-9ef6-2fc9bea9d461

The wallet that @J1 Pelaez is developing will soon solve the HTML inscription indexing issue.
https://x.com/photokuro_/status/1926039034972770728?s=46&t=JW1pg7_IIadjAvbTBWt-nA