Let's take by hypothesis that there is a secondary mental/spiritual/non-physical reality as well.
Then I can ask: well, given this mental "essence"... HOW do we see actually?
How does the non-physical essence actually see?
That would still go unanswered.
It would still be unsatisfactory.
We should better theorize a third non-physical and non-spiritual reality.
But then HOW does that reality actually make us see?
So theorizing 2+ concurrent realities is completely inconsequential, unless we can actually find them useful somehow.
Sure, they are possible... but irrelevant to anything except maybe feeling special cause they make you feel like "there is more to me than in this brick next to me"
I admit that I don't understand how the mental dimension works, in the same way as I don't know how to explain vision to a person who has never seen before.
I conclude there must be an extra-physical dimension because consciousness, amongst other things like vision and emotion and thought doesn't seem to be able to be explained by science, which is the study of what is physical.
I'm going to discontinue this discussion because it seems like I cannot understand you and you cannot understand me. You doubt my sincerity excessively and therefore I think this discussion is unlikely to yield results.
I can understand you, hence why I could pinpoint a question you are ultimately unable to answer: how can you tell if anything, other than yourself, is conscious?
And science is not the study of what is physical. It's the study of anything that has a phenomenon we can sense in any way.
That includes vision, emotion and thought. They cannot be studied DIRECTLY, of course, because they are abstractions. Exactly like gravity. As far as we know there is no physical entity associated to "gravity", it's just an abstract model to explain some phenomena we perceive.
Ultimately, we have no idea what exactly these things are that we call "matter", "space", "time", "energy". You want to add "mind/soul/something" to the picture. Fine. But if you cannot come up with how that "mind/soul" is related to everything else, it's completely irrelevant to anything.