Lenovo TAB3 10 Plus User Manual page 7

Press and hold the On/Off button and the Volume down button at the same time.
Viewing pictures and videos
Photos and videos are stored in your device's internal storage. You can view your
photos and videos by using the following methods:
Tap the photo review icon when using the Camera app.
Go to Gallery.
Screenshots are stored in your device's internal storage. You can view your
screenshots by Gallery.