[2023] Problem with Cloud saves

Steam cloud saves can be seen here:

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store.steampowered.com
If yours are not there, that basically has to be a Steam issue. Click on this game in your Steam Library, what does it say about cloud sync status there?  

Do your cloud saves appear on that Steam page? Or not?  

Is this only with CK3? What if you do cloud saves with EU4, Stellaris, or CK2?

And has this always been the case with this game? Or it was okay up to some point?

You could try a Steam Flush Config

Steam Support :: Clear download cache

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