Save system and Cloud Saves

More of a input question rather than an issue. I know UE has a built in save system, and the online subsystem has functionality to make use of many online platform’s cloud save systems. Can these both be used with one another? I only ask because when I looked at WriteFile in the docs it takes an array of UInt 8s. Even if the 2 cannot be used together I have noticed that steam has cloud sync that uploads save files to the cloud without dealing with the coding side of things, but my concern is will other platforms have this as well? the platforms that im concerned about is EOS, and the Game Consoles.