Are you running the current version of iOS? Are you signed into iCloud, and do you have storage enabled?
I have no idea. I do not know what IOS is? How do I find out?
Also, what generation iPad do you have? General->About->Model number
I am signed into iCloud, I just got an update to install and am installing it now but it looks kind of frou frou, something about being able to use Apple pencil features but I’ll install it.
As for storage enabled, I am not sure.