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So I just checked on the prime video app on my phone, which I would never watch a movie on, and no time to die shows 4k UHD and HDR. Could it be a Roku issue?

I really don't watch movies on Amazon prime much, but a few weeks ago I viewed the Protege. It was listed as UHD HDR. It looked great. A few days ago I watched A Quiet Place part 2. I couldn't find any mention of UHD, but it did say HDR. But when I watched it, it didn't trigger HDR mode on...