how do I add Saving To Steam Cloud?
you need two pieces: local save (SaveGame) + cloud transport (OnlineSubsystem Steam RemoteStorage)
save your data to a slot, then on successful save push bytes to cloud with WriteFile, and on boot check Enumerate then GetFileContents to pull it down before Load
if you dont want to wire all that, advanced save system from fab Save System / Cloud Save / Encryption / Slot management | Fab has steam cloud + eos cloud integration with auto detection, you just use save/load slots as normal and flip cloud on if you configured steamworks/eos