Roku Device Features, Settings & Updates

Help configuring Roku device settings, using Roku OS features such as screen mirroring, adjusting display type and audio settings, using Guest Mode, and assistance with software updates.
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Level 7

New Roku 4800 - File format for 4k and Atmos audio

Just bought the new Roku 4800 since it supports Dolby Atmos.  I would appreciate any feedback in advance for file formats and codecs that work for playing 4k video and Dolby Atmos audio from a file.  To try to make my question clear, I would like to use a USB drive or DLNA server to play something like an M2TS, MKV, or MP4 file through Roku Media Player.  For some reason in researching online it seems hard to find good, non-conflicting information about what has actually worked for real users or a clear indication for what Roku can play.  I know that I can do some experiments, but am hoping for some advice to help make this a more smooth transition.  Thank you.

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