Handheld AR real surrouding not appearing, only brown-tile background

Hi, everyone. I’m new to Unreal Engine and I’ve been trying out the HandHeld AR template available. However, when I tried launching the AR app to my Android, it scans and objects can be placed, but my real surroundings did not appear. There’s this brown-tile background only. What should I do? Is there something wrong I did? I’ve been stucked on this for two days already. I hope you guys notice my question. Thank you
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Here is the picture that’s happening on my Android

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