iCloud Photos too large and cannot upgrade storage
I cannot enable iCloud photos on my iPad since it complains that my storage is too small for the amount of content/photos that I have. Whether I try from my ipad or iCloud (on PC), when I go to change my storage plan it reports "Completing Purchase..." but then does nothing and pops back to the screen asking what plan I want to upgrade to. I've gone into iTunes to make sure that my credit card info is correct, but something is stopping the upgrade from processing correctly.
iPad, iOS 8.4.1