You can say that. You can say a lot of things to explain consciousness in a materialistic sense, as in how it could've emerged. But I cannot fathom how material interacting with other material and forces gives arise to subjective experience. It simply makes no sense to me. If I create a copy of my brain, it would be conscious, but with its own unique subjective experience. This makes sense so far, but what exactly is this subjective experience and how can "mere" mechanical matter create such an entity.
So in short: I cannot understand what is the actual substance of subjective experience.
So in short: I cannot understand what is the actual substance of subjective experience.