I've got a similar issue. I tried reinstalling steam and factorio without success.
It won't upload a specific save and I'm guessing it's because of it's size? (450mb)
Have you checked the cloud logs in steam folder?
I see this error:
[AppID 427520] Upload Invalid Parameter for file Factorio ...
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- by Flo-P
- Tue Oct 26, 2021 1:57 am
- Forum: Technical Help
- Topic: [1.1.39] Steam cloud saves not syncing to Steam
- Replies: 5
- Views: 7600
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