How to Make AR Foundation "Planes" detected into planes that collide/interact with objects?

Apologies for this noob question -
How does one make AR Foundation Planes detected into surfaces that interact with objects (for ARKit)?

Thank you in advance for any guidance.

One of the steps for setting up plane detection is to create a prefab for the plane objects - that prefab will be spawned everywhere a plane is detected in the world. So however you want to interact with planes, setup that prefab to do it. For example, if it the prefab has a Mesh Collider on it, all plane objects will have that collider.

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Thank you so much!