Lenovo YOGA TAB 3 8 (English) User Guide - YOGA Tab 3 8" (YT3-850F/L/M) - Page 18

Settings > Personal > Security, Unknown sources, Media device MTP - manual

Page 18 highlights

sources. Go to Settings > Personal > Security, select Unknown sources and switch to open. Copy the APK file from the computer to the device in "Media device (MTP)" mode. You can manually download a file management app, and then open the app in the download file management directory.

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sources.
Go to
Settings > Personal > Security
, select
Unknown sources
and switch to
open.
Copy the APK file from the computer to the device in "
Media device (MTP)
"
mode.
You can manually download a file management app, and then open the app in the
download file management directory.