Sorry — I can fix it, but I need a little info first.

• Open your browser DevTools (F12) → Console. What errors do you see? Copy/paste them here.
• Which model/type did you try (Stylized, Photo upload, or Real sample)? Did anything at all render (blank screen, UI visible, but no model, or error popup)?
• Which browser and OS are you using?

If you want I can also push a patched version that adds defensive checks and console logs so we can pinpoint the problem quickly — tell me to proceed and I’ll produce the updated project files.