1. Open the Files app on your device.
2. Navigate to the folder where the downloaded music is located.
3. Tap on the music file to play it.
4. The music will start playing in the Music app.
To play downloaded music in the Google Play Music app:
1. Open the Google Play Music app on your device.
2. Tap on the Menu icon in the top-left corner of the screen.
3. Select Library.
4. Select Songs.
5. Tap on the Downloaded tab.
6. The list of downloaded music will appear. Tap on the song you want to play.
Note: If you downloaded the music from YouTube, you may need to convert the file to a format that is compatible with your Android device. You can use a free audio converter app for this purpose.