To clear something up, because when I searched my question it really wasn't answered:
If you are like me and are trying to move the folder with all the mods, saves, etc for Sims 4 because it got rather large (for me I wanted to move it from an HDD to an SSD so that the load time was better and hopefully make the game smoother), you do NOT just take the documents folder and copy and paste it or cut and paste it to where ever you want.
What you do need to know is how the Documents, Pictures, Downloads, folders work and how they are located and how other applications locate them. If you right click on the Documents folder (this is based off windows 10) that actually looks like a document and not a folder for the icon, (by default this is usually in the Quick Access panel on the left side of your open folder). Right Click and go to Properties > Location > and here you will see the exact drive and location this folder is, which is going to be more specific than the navigation bar in your folder at the top which will most likely say "This PC > Documents".
To change where this Documents folder "lives" you can create a new Documents folder in the drive or location you want it to be, then type the path to that new folder in the box where you want the Documents folder to be located. You can also click "Find Target" and navigate to it as well. When you do this and click Apply, windows will ask you if you want to move all the files from your Documents folder's current location to the new, and Yes you want to. Depending on how much stuff is there it will take a few minutes.
For a more detailed guide see any of the links that explain how to move the documents folder.
Now what wasn't really clear in a lot of step by step guides is how the game locates or looks for the documents folder. Some people explained how to find out where the game is looking but not why it looks there
The game does not go by the actual location that the Documents folder is but rather the location of the Windows Default Documents folder that has the Document as an Icon. This is the default windows Documents folder for the current user logged in. Its actual location on the drive or which drive its on is irreverent because you told windows where to physically store it. The game doesn't care where it's physically stored, just that its the Default Windows Documents folder, and since you told windows where to move it, the game doesn't even know it moved.
The game is basically looking at the folder that is "This PC > Documents" where ever that folder is, the mods, saves, etc are going in there. (Electronic Arts\The Sims 4 folder to be more specific).
That's why when people upgrade their windows version their game seems to loose all the saves and mods. This is because when the upgrade happened, the Windows Default Documents folder has been moved to the default location that windows uses, which is C:\Users\(your user name)\Documents.
As long as you move the documents folder in the manner I described, everything will be fine.