This is unusual that this is happening. I've just taken a photo myself on the iPad and have uploaded to FB successfully, so I really don't know how this can be happening. So what I recommend is the usual steps for when the iPad goes a little wonky, close your apps completely and do a restart and or reset. It may be the camera app playing up here for some reason. From the home screen do the four finger swipe up or double press the home button to reveal your multi task bar. These are all the apps that you have opened at one time. Long press an app until it jiggles and a red minus sign will appear above it. Press the minus sign, this will close the app, not delete it, now press the home button to return to your screen. It's also a good idea to close all these apps, as it helps the iPad run smoothly. Give it a try and see if it's now working, if not a restart/reset are the next steps. Let us know how you get on.
Sent from my iPad using iPF