Lenovo TAB3 8 User Manual page 18

Sync
You can transfer data between your device and computer. Transfer music,
pictures, videos, documents, Android application package (APK) files, and so on.
Connecting your device and computer
Connect your device and computer with a data line.
Slide down from the top of the screen, you will see "USB computer
connection " in the notification bar.
Tap USB computer connection for other options.