Hi!
We don’t know the “VR (Pico Neo 2 headset)” platform, so we can’t give you specific advices. But usually the first thing to check is if there’re any issues during the packaging/cooking phase. You can check for warnings or errors in the Output Log window.
If no warnings and errors are reported during the packaging phase, you have to check the runtime message logs (https://docs.unrealengine.com/4.26/en-US/SharingAndReleasing/Mobile/Android/AndroidDebugging/).
As a reference, try running our demo application on your device: https://github.com/UNAmedia/ue4-stereo-panoramic-player-demo . It’s compatible with Android and tested also with Cardboard VR.
For further help, we need a copy of the log files generate during a “fresh” packaging and a runtime log retrieved from the device.