After a while of scrolling through the Gallery, it stops loading and I can't scroll down anymore. Also, I am sorry if I uploaded this post twice it was an accident.
@SepticeyeSav I just tried to access the Gallery in a new folder, and it worked fine both from within CAS, from Manage Worlds, and from an active lot. How does it work if you try in a new folder? Here is how. Don't move over any of your old files until you have tried to access the gallery in the new The Sims 4 folder:
Here are some other good troubleshooting tips: