iCloud best practice?

Yeah I had begun to think the third option might be the safest one.

I’ve noticed that when switching between my Mac Mini & Macbook Air, if I am working from my project file directly stored in iCloud Drive, it brings up an error claiming the document is still open. So, if I have been working on it on my Mac Mini, save and close it, then go back to it on the MB Air, it thinks its still open for some reason and warns there could be corruptions if I proceed…I’ve checked back on the Mini, and the document is certainly NOT still open.

I guess I’ll change how I work with it, just to be on the safe side and to avoid any potential corruptions or loss of data.