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As KyauSana said, the Dolby Atmos feature only runs on Android 9 (Pie) and was also introduced first in the Galaxy S9 series back in 2018. Unfortunately, you can't run the Dolby Atmos feature on your Galaxy J7 Pro due to hardware limitations. You might need to upgrade to a Galaxy S9 or higher phone series to experience Dolby Atmos' premier sound experience.