I meant something I can open on an Apple device to see HDR in action.

The video from the screenshots: https://www.youtube.com/watch?v=tO01J-M3g0U

I looked at that, and it does not appear to result in brighter-than-white output on my iPhone 12 mini.

That went through one or more conversion steps so who knows...

I'm not willing to give my email addy out for those sample clips either, so I guess I won't know too soon.