Greetings Charlie2504,
I understand you're looking for assistance with your iCloud storage, so check out the following information to see if it's able to help with what you're seeing.
With checking your iCloud storage, you can use any Apple device, or a web browser, to determine what is using your storage. If you're wanting to determine what photos and videos are backed up to iCloud, it would be best to use iCloud.com. For assistance with steps on how to do this, check out the following resource:
Check your iCloud storage online or on any device
If you see that you need to make an adjustment to what is syncing or backing up to iCloud, check out the following resource:
Change your iCloud settings
I hope that information is helpful with what you're experiencing. If you have additional questions, be sure to provide more details, if applicable, for a better understanding.
Cheers!