The issue is not “how they work together”. That is proving a negative. It does not exist. That is the issue.
What exist is the ability of transferring thought. Not quite the “power of suggestion” but that may be a side effect. We have no physical connection and by extension control of the spiritual reality of the soul. And yet it exist in physical reality just beyond our ability to physically realize this spiritual reality is there. In fact the term “spiritual” seems out moded, because it is relegated to a religious concept with no basis in reality at all.
The reality is that this spiritual dimension can affect the physical, but the physical does not have the ability to co-affect in any significant amount. So asking how it works can affect an array of emotional responses. The physical will never have an answer until the spiritual side of the equation is given back into the ability of the physical to interact in any meaningful way.