This film has many wonderful mystical themes on the nature of the soul, the afterlife, premortality, and the meaning of life.
Is matter the incarnation of spirit? Is this what makes spirit visible, and even makes ourselves?
It is not something that happens sometime in the future, long after our death, but something which we already are that we may come to realize right now.
He has a mystical experience in which he sees "Pure White Light" and feels an "All-Embracing Love."
I suggest that the physical object that Joseph had in his possession was not literally ancient gold plates, but plates of his own creation which talismanically represented the "gold plates" of his visions, aiding his mystical translation of those visions.
A new translation of Genesis 1, updating many ideas in terms of modern cosmology, but also in mystical terms of God's own Incarnation in and as the cosmos, and in all Life as well.
One of the major themes in Disney's Frozen II is the journey into the unknown, which is a common element of the mystical journey into communion with the Divine.
Physics tells us that all things are made up of massless light-speed particles that have become bound together giving rise to mass and spacetime. Is this the Incarnation?