Lately, I’ve noticed that nothing is synching between the two computers. If I file something in my Documents on the desktop, it doesn’t appear in the files on the laptop. Is there a quick fix to this?
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Sounds like iCloud Drive's desktop/Documents folder syncing is not active on one or more of your devices. To check that this feature is turned on go to System preferences/AppleID/iCloud on each of the machines. Here's a brief overview:



If the option below is not checked for you, check it. However, there are consequences. Your Desktop and Documents folder will move from their traditional location inside the user's folder to the iCloud Drive folder.



You can now find your Desktop and Documents folder in the iCloud Drive area in the finder window on the left column as seen below.



This will merge the contents of both computers. You may see your desktop items disappear temporarily. This frightens people but nothing is actually gone. Just moved to a new folder dedicated to syncing to the cloud.

Note: You can also see the contents of these folders via your phone or iPad using the app called "Files". It's already on your devices. Apple devices ship with it pre-installed.

If you have any questions or run into issues, I'm happy to assist. As you can see above, I don't personally use iCloud Drive syncing as it turns the desktop folder into a cloud based location which means everything you place there syncs. While this is great for most people, I use the desktop area as a heavy workspace and can't afford the performance loss that syncing causes. In other words, editing a video, audio file, or similar that lives on an iCloud desktop is slower compared to a non syncing folder.