An interesting change in the YouTube Android app now lets some users playback videos at up to 4K resolution at 60FPS with HDR on devices with lower res-displays. The new feature is seemingly a server-side update as I’m using version 15.05.35 of the YouTube app and not the latest 15.06.35 build which released on February 13. Last year the iOS YouTube also app gained 4K playback with the rollout of iOS 14. Newly added 2160p playback option in YouTube app In my personal testing with a Galaxy S10e playback at 2160p worked well though when I switched to a Galaxy Tab S5e playback fared...
Source: https://www.gsmarena.com/youtube_for_android_showing_4k_playback_option_for_some_users-news-47842.php
