I am using a Samsung Note 9 running Android 8.1. I would like to add a button to the navigation bar that brings down the notification drawer. This was possible natively on a previous version of Android (at least on LG phones), but now it will require some ADB code, something along the lines of:

settings put secure sysui_nav_bar "key(KEYCODE_CONSTANT:file:///path/to/icon.png),back;home;recent,menu_ime"

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