Q: Purchased 1o gb more of iCloud storage yesterday,yet my iPad has not been updated with this storage upgrade. Must I do something further to make this work?

You might need to contact the Apple online store and ask them to confirm that the purchase went through, and if so, when you can expect to see the additional storage.  (If they try to charge you for a support call for this, ask to talk to a supervisor as you aren't asking for support, you are only asking when you will receive what you paid for.)

If you're in the U.S., you can reach them at 1-800-MY-APPLE.