Can you try it again and see? Or, click on the page, then add your screenshot to the chat with your prompt.
Honestly doing 3D may be a bit tricky in Onlook but super curious to see if you get it to work. It works just like a normal browser would, but the complexity of knowing how to setup a 3D site like that may be too advanced for Onlook.
Then, it ultimately left up a window which says "Welcome to your new app" and displayed the prompt:
>create a site for creating, editing, and previewing G-code in 3D using blockly.
but I don't see anything beyond that.
I will note that I had a similar result with a far simpler prompt....
Or, let's turn this around --- could you provide a page which documents a successful prompt/project? If you'll let me know the link of that, I'll try it, then once I know this works for my credentials, will try again with the effort I was making.