Hello jimfromgilman,
Thanks for posting on Apple Support Communities. It seems that you aren't able to save a photo that you are editing on your iPad. Does this error occur with every photo you try to edit and save? This could be occurring due to the amount of available storage on your device. Have you checked to see if you are running low on available storage space?
If this is the case, the following articles may help you manage and optimize the storage on your iPad:
How to check the storage on your iPhone, iPad, and iPod touch.
About storage on your device and in iCloud.
Manage your photo and video storage.
If storage is not the issue, the next step we would suggest is to update the software.
Update your iPhone, iPad, or iPod touch.
Cheers!