Elsie, do you have screen shots of the scriptures that teach about the preexistance?
I'd think that you Mormons would have access to this stuff.
Here's the best I can do:
The Creationist viewpoint says that God creates a soul each time a human being is conceived.The Bible seems to place a separation between the creation of the physical body and the creation of the soul.
https://www.compellingtruth.org/life-begin-conception.html