Tap on build number 7 times until you get the prompt that says “You are now a developer”.
Search for “Developer options”. This menu is located at different places in different Android devices.
Go in and enable “USB debugging”.
Touch for more options.
Select “Transfer files”. Check the checkbox “Always allow from this computer” so that it doesn’t prompt every time you are connected and click [OK]. You can remove the always allowed with “Revoke USB debugging authorizations”.