Frame.CameraImage.Texture has no data in Arcore - c#

I am working on a project using ARcore.
I need a real world screen that is visible on the ARcore camera, formerly using the method of erasing UI and capturing.
But it was so slow that I found Frame.CameraImage.Texture in Arcore API
It worked normally in a Unity Editor environment.
But if you build it on your phone and check it out, 'has no data'.
Texture2D snap = (Texture2D)Frame.CameraImage.Texture;
Perhaps texture is a null value.
What is the reason?
If this doesn't work, is there a way I can only bring images of the real world from the mobile phone environment?
The real world image is required for use in image segmentation and should not include images of augmented objects.

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Source
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