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it depends really, your TV might be 4K enabled but the app built in might not be a 4K app, you really need to post what make/model of TV you have.
With Youtube on most Tv's when you're playing a video bring up the progress bar, then if you click the 3 dots highlight quality and press enter and it will give you a list of options for playback, IF it's a 4K app the option for 2160 should be in the list |
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