Why doesn't my MacBook Air show my files on iCloud Drive?

Hi,

In the Finder on my MacBook Air, I do not see any files when I click on iCloud Drive. Yet, when I open icloud.com in the browser, I see all the maps and files I have stored there. Also, on my iMac I see them all. Does someone know what is going on there, and how to repair this?

Thanks a lot!