To extend the complimentary Storage by paying for it please see this page:
and expand 'How do I purchase my current plan' for instructions. From what it says you should be able to do this at any time and it will come into effect on the 30t.
Many thanks for the helpful reply!
I'm not sure why the person at Apple Support who I spoke with on the phone couldn't have provided this information.
The upgrade process is not intuitve - why would one choose the option to downgrade, when one is not in fact choosing to downgrade in any way?
I'm also still annoyed that it isn't easy to see at a glance by looking at your account whether you have purchased an upgraded plan or not, and to easily see when you last updated your subscription, and which subscription is currently in effect. The current approach makes it hard to know whether you've upgraded or not.
I really think I won't be the last person to be confused and frustrated by the poor process and labelling around the upgrade options!
I have the same issue as Nicholas, but I cannot see how the support link solves the problem. It appears that I have already purchased the additional 20GB, though not surprisingly, I cannot recall doing it. I cannot do it again because the option is already selected.
Perhaps my only problem is that Apple keeps sending me annoying warnings that are taking up my morning coffee time?
If you have actually purchased an upgrade, that will have cancelled the free storage from the time you made the purchase, and it will expire a year later.
If you did not purchase an upgrade, then your free extra storage will show as if you had purchased it, and will expire on Sept 30th, in which case you need to follow the instructions in the link I gave you or you will lose it.
What date does it give here? -