Oxygen not included is not syncing with Steam Cloud

Looking at your attached Player.log your save file has been converted to a local colony at the following location. Could you check to see if the save files are there?

Documents\Klei\OxygenNotIncluded\save_files\Nixxx Bomba

If that's the case you should be able to ignore the error message Steam is showing you when you try to start the game.

Hello. I found out that the problem was the DLC. Since the game was not syncing properly, when I join the game and try to load my save, with the DLC on, it won't let me. And the buttons to convert to cloud or back was not working, I was pressing it and it was doing nothing. But the solution was: I closed the game, reopen it, turned the DLC off and then it worked and let me reload my old savegame.

Changed Status to Fixed

Glad that's all it was. I'll look into adding a tooltip explaining why it can't be loaded.