[How do you add a Custom Emulator?]

Open your Launchbox, go to Menu > Tools > Manage emulators > Add. Start typing the name of the emulator you want to add , such as RetroArch. Launchbox should automatically detect some settings. But you will still need to point Launchbox to your emulator application.

[How to add ScummVm games]

You can start ScummVM  on your Android. From the orange launcher screen,  you can choose Add Game Navigate to the folder sdcard where you copied the data files . A handy tip is to press eg and the 's' key to jump straight to entries that start with 's.

[Android APK on Firestick/Fire TV]

Process of connecting USB flash storage device to your android phone:

1. First connect USB OTG cable into your Android phone.
2. And then connect USB flash storage device to female connector of OTG cable.
3. And the last thing is, file explorer on your phone should automatically pop up.

[Sega Naomi Emulator]

You can update your core later to latest version with the Vulkan renderer , it is available for windows and android.