As far as I know, it uses the default keyboard from oculus. So it trigger whenever you call for anything that has text input on the game. I dont think it works on preview VR, only on launched games from oculus itself, because the VR preview is running on the pc. Maybe for the same reason you could use VR preview with big meshes with lots of polygons and when you launched on the oculus it doesnt play at all. But just guessing here
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