Re: if cloud shows up in the gallery does that mean something is saved there?
Welcome to Android Central! No, it's just thumbnails. You can choose to download a copy of a cloud photo to your internal storage, but if you don't, the full size pics aren't saved to the phone.
If you tap a cloud photo to view fullscreen, I think the full sized photo is temporarily saved to the cache, but cached files are temporary, and get emptied intermittently (or you can yourself).