Screeneo U5 Input Signal

For 4K programming, is it better to send the U5 a 1080P signal or a 4K one? I ask because my Apple TV 4K keeps reverting to 1080P with Dolby Vision, but my Amazon Fire Stick 4K and UHD blu ray player are fine sending 4K signals to my U5.

Hello, please check this video for the Apple TV: Screeneo U5 | Apple TV with Dolby Atmos and Dolby Vision - YouTube

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I found this link somewhat helpful, too.

I also changed the output on my AVR from dual output, which was sending the signal from my Apple TV 4K to a non-HDR input on my TV as well as to my Screeneo U5, to just my Screeneo. All is good now.