Lenovo YOGA Tab 3 Pro 10" YT3–X90F User Manual page 19

such as Idea Tool on the computer to manage your tablet's data.
Installing APK
Follow these steps:
You need to set the device to allow installation of apps obtained from unknown
sources.
Go to Settings > Security, select Unknown sources and tap OK.
Copy the APK file from the computer to the device in "Media device (MTP) " mode.
Open the apps category in the File Browser.