Here is a problem i never had on linux but i started getting on windows.
Some games say they are unable to sync (seemingly random), when i start a game the save does seem to have downloaded, but i cant sync it as it is right now, even doing so manually keeps throwing the same error
the steam forums are a horrid mess to sif through
but i was able to find some similar people and all they got suggested was retrying until it works or enable and disable syncing altogether, neither unfortunately worked