iCloud running out of space, but it's not
Open System Preferences and inspect your iCloud Storage there. What you are looking at in Finder is only the size of your iCloud Drive files.
After opening System Preferences, select &quot;Apple ID&quot; in the top row, or &quot;iCloud&quot; in the bottom row if you are running an older version of macOS. On this screen, you will see a meter indicating your storage usage. Hover over different segments to see information about them, and click &quot;Manage&quot; to see more detail.