Hi allichard,
It sounds like you're having an issue with local device storage on your iPad. As there's a difference between iCloud storage and the local storage on your device, the article viewed prior to posting can help clarify some details: What's the difference between device storage and iCloud storage?
So you can start taking and receiving photos and videos again, you'll need to make space on your iPad. First check the recommendations offered in your Storage settings. The steps below found in the article here will get you started: How to check the storage on your iPhone and iPad - Apple Support
"Use recommendations to optimize storage
In the Storage section of Settings, your device might offer recommendations for optimizing your storage. To optimize your storage:
- Tap Show All to see the recommendations for your device.
- Read the description of each recommendation, then tap Enable to turn it on or tap the recommendation to review the contents you can delete."
You can also find helpful information here: Manage your photo and video storage - Apple Support
Cheers.