How to install apk in Android 10?

Just updated to Android 10 and found apk cannot be installed from just any file manager or other apps. The solution is simple and given below.

Go to setting of Android -> Storage -> Select storage -> Browse and install apks.

Or

Google's own app called "Files" can install apk files. Download files apk from playstore and install backup apks. This feature is extremely important because many apks are no longer available on playstore due to various reasons. For example my  i own games i unpublished from store. There may be other apps which can install apks.

Adjust audio left right balance in Android 10 (tested on Nokia 8.1)

Audio balance option is many times required for gadgets where LR is wrong or some people cannot hear equally from both ears due to various reasons. This feature of Android 10 will help.

As the screenshot shows this option is present in Accessibility settings at bottom. But before confirming LR has imbalance use "Mono" setting and check if both lr are equal in volume. If there is difference then spin disable mono setting and use spin control to slide LR until both ears hear equal.