Something has to be occurring during import.
I am dragging the folders from within the 'Assets folder' into the project panel directly. None of the videos give an explanation as to whether or not this project requires a unique import process or project setup.
The other labs had a simple .unitypackage file to use, or just one big folder to drag and drop.
This project size is HUGE, lol. I'll keep tweaking and maybe import things appropriately by chance.