YouTube App Adds HDR Support for iPhone 12The most recent YouTube App update (15.45.2) has added HDR support for the 
iPhone 12 mini, ‌iPhone 12‌, 
iPhone 12 Pro and ‌iPhone 12 Pro‌ Max. YouTube has supported HDR on its iOS app since the 
iPhone X but has required updates to support new hardware.

To check to see if you are watching YouTube videos at their highest quality, you can simply press the three dots on the top right of the video, and you should see "HDR" options listed on supported videos. 
HDR options are also only available on devices released since 2017 that have OLED displays (so that excludes all 
iPad models and the 
iPhone 11 and 
iPhone XR).<div class="linkback">Tag: 
YouTube</div>
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YouTube App Adds HDR Support for iPhone 12" first appeared on 
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YouTube App Adds HDR Support for iPhone 12