Hi mayyou,
The resource below explains how to use iCloud Drive and how to manage your iCloud storage. If you need additional support regarding your iCloud account purchased storage, there is a link to the iCloud Support team below:
iCloud Drive FAQ - Apple Support
https://support.apple.com/en-us/HT201104
When you sign up for iCloud, you get 5 GB of free storage. Your iCloud storage is used for iCloud Backup, iCloud Drive, iCloud Photo Library, iCloud Mail (your @icloud.com email account), and data from apps that use iCloud. Your purchased music, apps, books, TV shows, and My Photo Stream don't count against your 5 GB of free storage.
You can manage your iCloud storage or buy more storage using your iPhone, iPad, iPod touch, Mac, or PC.
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Have a good weekend,
- Judy