3D Touch is available on the iPhone 6s, iPhone 6s+, iPhone 7 or iPhone 7+.
You can change the amount of pressure you need to activate 3D Touch in Settings app > General > Accessibility > 3D Touch.
On the same screen, you can turn 3D Touch off and on.
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Tap Settings at the bottom and select General.

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You can activate Quick Actions and/or Peak and Pop.

Quick Actions

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After activating the Quick Actions, press nPlayer at the home screen.
Recently played files appears.
* The files in the locked folder are not displayed.

Peak and Pop
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After activating the Peak and Pop, press a file in the list.

(2)

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You can preview a content.