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I can't test my 3d object.

I've tried 3 android phones already and it still doesn't work.  Everything works fine when scanning the object. But when I press "test" button,The app can't seem to recognize my 3D target models even though I just scanned them. It only shows the green cube at the corner of the scanning paper field but when I take objects out, nothing happens. I've also tried many objects but they're still can't be detected.