How do you pay my storage is full

Re:  my storage is full

If this is storage on your iPhone:

To see which files are taking up the space:

How to check the storage on your iPhone, iPad, and iPod touch - Apple Support

Re: I can download:

how to back-up everything on your device, before deleting anything

This is just in case you want to restore the whole back-up, ie: whether to retrieve all or part of your data).

How to back up your iPhone, iPad, and iPod touch - Apple Support

Re: how do you download it:

To import iPhone photos and videos to Mac

How to: Transfer images in Image Capture on Mac – Apple Support (AU)

or

To use Photos app to import photos and videos into Mac or PC

How to: Transfer photos and videos from your iPhone, iPad, or iPod touch to your Mac or PC - Apple Support

Re: How do you pay

Your iPhone comes with a set amount of storage space.

You can't buy, or add space to it.

If you choose to buy more storage space from iCloud,

that won't change the storage situation on your iPhone.

(iCloud syncs everything (delete from one = same deletes from other).

What's the difference between device storage and iCloud storage? - Apple Support

If needed, so you don't have to buy iCloud space:

How to: Manage your iCloud storage - Apple Support

or

To buy more iCloud storage: Upgrade to iCloud+ - Apple Support

All the best :-)

ka233 Said:

"How do you pay my storage is full: I can download how do you download it"

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iPhone Storage Full 

jennissie Said:

"iPhone Storage Full: My iPhone Storage Full"

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Try Removing Of Data from the iPhone itself...

Troubleshooting iPhone Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support. 

So, what to do:

Clear Space:

Try clearing internal storage though use of the following:

What Space to Clear:

A. Clear Temporary Internet Files:

Clear your Temporary Internet Files(Cookies & Cache) of Safari:

• Cookies perform remembrance of certain site-entered data.
• Cache keeps a snapshot of the last time you visited a site.
• Go Here: Clear the History and Cookies from Safari on your iPhone, iPad, or iPod Touch - Apple Support

And...



B. Clean TV and Music Libraries:

Remove all unneeded files from your TV and Music Libraries. Full-Movies take up 2-4GB typically, and a bunch of those would take up a load of storage, ideally. So, if you have any movies that are not needed, then delete them.

And...

C. Rid of "System Data" (Formerly Called "Other"):

Back up your iPad, and then restore your iPad form a backup. For reference, refer to my User Tip:  Clear Other Storage on your iPhone or iPad - Apple Support

ka233 Said:

"How do you pay my storage is full: I can download how do you download it"

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As for iCloud Storage:

Download All of iCloud:

Avoid the upgrade payment, and just download it all. Once downloaded, make sure you can access it from the drive. Once accessibility is confirmed, you'd clear iCloud of large items, and/or all items. Perform my User Tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip