Hi gnettenstrom,
Welcome to the Apple Community,
where some of us do our best to help each other troubleshoot.
Apple support have an article to help with iCloud Drive:
Access and manage files in your iCloud Drive
says:
On iCloud.com
From a supported browser, sign in to iCloud.com with your Apple ID.
https://support.apple.com/en-us/HT201104
_______________________________________
Wondering if the 4.2 Gb is a back-up being saved ?
In this online article from Apple Support:
What does iCloud back up?
says:
"Depending on the size of your backup and the amount of content you keep in iCloud, you might run out of free space".
and:
"If you disable or stop using iCloud Backup, your last backup is stored for 180 days"
https://support.apple.com/en-au/HT207428
Another article:
Manage your iCloud storage:
says:
If you run out of iCloud storage, your device won’t back up to iCloud
and:
for Mac
- Go to Apple menu > System Preferences > Apple ID, then click iCloud.
- Click Manage and select Backups.
- Select one of the device backups, then click Delete.
If you want to turn off Backup and remove all backups for that device from iCloud,
choose Delete when you're asked to confirm.
When you delete a backup, it also turns off iCloud Backup for your device.
https://support.apple.com/en-us/HT204247
Hope there's something helpful / useful to you here :-)