This is a suspend/resume bug. Go to Config > User Interface and disable "Pause on Hide." This allows the emulator to run in the background. Note: It will drain battery, so close it manually when done.
Inside the app, tap the three dots > "Config" > "Paths" > "Add" and navigate to your ROM folder. dolphin for handheld 1.2.1
If you want, I can:
For the emulation community, specific version numbers often become legendary. While the official Dolphin Emulator continues to update on PC with bleeding-edge features, (often associated with the "MMJ" or "Handheld" forks popular on Android and devices like the NVIDIA Shield) represents a specific, highly optimized era for mobile gaming. This is a suspend/resume bug