Create package executable, info asset size. organization

Hello everyone, beginner question, I bought a lot of assets on the marketplace. I usually merge these assets into my content folder, I’m having trouble because I can’t move them into my custom folder. Is there an application that allows me to move these assets or media to my custom directory without screwing up?

Also, does Unreal only compile the media used when I create a package? My game demo seems relatively large 8 gig for a single demo.