Q: My IPAD 4 takes great photos but will not save the edited photo

Don't know what your question is but the edits are saved on a separate file with the extension .AAE. If you import the photos to a Mac the edits will come with the photos.

Import photos and videos from your iPhone, iPad, or iPod touch - Apple Support

Are you tapping Done after editing ?

If these are photos taken by your iPad it's time for some basic trouble shooting.

Reset your iPad. Press and hold both the home and power buttons until the Apple logo appears. Release both buttons. Let your iPad start on it's own.

If your still having peoblems go to settings> general> reset> reset all settings. Be sure you know your wifi passcode, you'll have to enter it again.

Next step is to Restore your iPad using iTunes on your computer. If you don't have a computer like me or the skills you need to get a friend to help or take your iPad to the Apple Store.