How to upload a Hybrid App to the Webflow Marketplace?

Hi :waving_hand:
I’m building a Hybrid (Designer) App.

In development (npm run dev) the app works fine in the Webflow Designer.
But after running npm run build and uploading the bundle.zip, the app opens with a blank screen.

Can someone please explain the correct steps to upload a Hybrid App bundle for testing / Marketplace submission?

Thanks

Do you see any errors in the browser console?