I don’t expect the image to move. Sorry for misunderstanding
Look at the navigation in here for example. It’s fixed.
When you’re on very top of the page, try to swipe up.
The navigation won’t move and won’t be covered with anything else.
Hovewer, if you swipe up in the Hype document I attached, the background,
which is in this case white will overlay part of the image.
I’m asking why, and how to fix this. It’s just a detail, I know.