Given that the best description of the movement of both physical objects and energy through space is a continuous function, it follows that space is infinitely divisible, as is time, which means that any finite space that is not a complete vacuum is unbounded in complexity and no finite description of it will be exact, so the best description is approximate.  In quantum mechanics, the best description involves probability distributions, but probability distributions imply a lack of knowledge of the exact nature at an exact time, so the finite description is incomplete, and no complete finite description appears to be possible, and that implies that complete descriptions, if they exist, would be unbounded in complexity.

The uncertainty of matter and energy in quantum mechanics has been referenced in relation to the subjects of consciousness and free will, but I believe this is misguided.  The properties of matter described by quantum mechanics apply to all matter and energy, not just that in human brains, and so it does not point to those brains behaving differently or otherwise being fundamentally different from other matter and energy, while such uniqueness of the brain is a basic assumption underlying the connection to free will as well as consciousness.

The recognition of free will is totally dependent on the frame of reference.  Every element of matter or energy could be said to have its own purposes, that of course were influenced by prior experiences of the rest of the universe acting on it, but if we take the moment of time at which this element is performing an action, the element is acting on its own power, its own purposes, according to its own “will.”  If we look at the history of it, we take note of the fact that it was influenced by all the other elements it came in contact with in the past, and we don’t see it as acting merely on its own purposes.

Also, the most common conception of free will is that it operates in a sort of vacuum, with the actor doing what the actor pleases without consideration of all the other forces at play at the time, when a more sophisticated and comprehensive approach is to recognize the actor is not operating in a vacuum and is continuously engaging with other forces in a sort of interminable wrestling match.  It is often claimed that when one considers the past influences on the elements, then it is “determined,” but it must be noted that every element is both determined and determiner, as it is affecting other elements as it is being affected in never-ending interactions.  Also note that none of it is completely predictable as the space in which it operates is of unbounded complexity, and any subset of the universe that tries to predict another subset is not only limited by the unpredictability of that space but also by its own unpredictability as its actions in trying to predict the other space will change itself.

As for consciousness, it involves feedback loops where the brain gets feedback of its own actions in a continuous loop, with the particular human experience of it being a function of the particular structures and composition of the human brain.