How do I stop my files I put on my Desktop (Macbook Pro) from automatically uploading to iCloud?

Lots of my files on my desktop automatically go up to iCloud immeadiately and without an internet connection I can't access them later. Is there a way to select a file individually on the desktop and make it so it stays on the local hard drive and not upload to the cloud?

I'm on high sierra 10.13.6

It's not possible to synch to iCloud without an Internet connection.

That definitely has nothing to do with my question

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