Hi I am unable to upgrade the storage

Hello ~ What happens when you try ? Messages? Have you worked through all of the steps here?

Upgrade to iCloud+

Any issues with payment?

Also:

What’s the difference between device storage and iCloud storage? – Apple Support (UK)

~Katana-San~

kashish1710 wrote:

Hi I am unable to upgrade the storage please assist

That is a true statement. An iPhone can never have more storage than it did when you bought it.

If you mean you want to upgrade iCloud storage, which does not add any storage to your phone, click on the Related Article at the top of this page for instructions.

For the difference, see→What's the difference between device storage and iCloud storage?