Ruthless_kk has put together a great tutorial on using The Sims 4 Gallery.
I have been getting a lot of questions about the Sims 4 Gallery. For those of you familiar with The Sims 3, the new Gallery takes the place of the Exchange but also gives us additional features. Finding your way around the Gallery is easy once you know what to look for.
First things first! The only way to get to the Gallery is In-Game.