Where are all of the collections pictures on the new iCloud drive?

After downloading the iCloud drive on my windows laptop, I opened it and realized it was empty. I thought that this was like a backup place for everything you want on your iPhone? None of my pictures are there, and the photo stream in my file folders on my laptop is only showing 7 photos. How do you get all of your combined photos on the iCloud drive?!

Yep i think you have to have it sync over to your conputer from your iphone