How do I show a different hero video on mobile than on desktop and make sure it works on all devices?@Media works for some iphones but not others.

Below is my current code. The point of it is to show a different hero video on desktop vs. mobile. 

It's working well for many iPhones, except for some iPhone 11 and 12.

How do I make sure it will cover all devices?

@media screen and (max-width: 641px) {
section[data-section-id="65e0094f8b572f1293662a84"] {
 display:none !important;
  }
}
@media screen and (min-width: 641px) {
section[data-section-id="65de97151bee7e00c709eef9"] {
 display:none !important;
  }
}

If you are on the latest version of Squarespace the mobile breakpoint is 767px not 640px, try using that instead as I'm sure some iPhones can be run at higher screen resolution than 640px wide.

Thanks I tried that but I'm still getting issues on iPhone 11 (see attached - the hero video doesn't load)

Also attached is what the area is supposed to look like

@ZiggyDM'd you

I have no idea why that system isn't loading your video. Does it work on an IRL device?

I'm not sure what your video is supposed to look like, but when I viewed the site on a real iPhone (with low power mode disabled, good battery life and high data rates) it looked like this: