Hi Travelpicsuk,
Thanks for posting in Apple Support Communities about your iPad’s screenshots.
It’s really unusual for the screenshots to turn black. Did they appear normal when you took the screenshot, and when you went back to view them later that’s when you noticed the picture was black?
Have you tried to Restart your iPad?
Is your iPad updated to the latest iPadOS 14.7.1? Update your iPhone, iPad, or iPod touch
With it not happening anymore, it’s going to be difficult to troubleshoot. But let us know if there’s any other details you can share that may help with finding out what happened.
Have a great day!