Give me some GB memory space for update
Why you cannot give some free space memory GB ?
iPhone 6s, iOS 14
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It would appear you have internal storage insufficient for your current and likely future usage.
That doesn’t get any easier.
iPhone internal storage cannot be increased.
You’ll need to offload more, or use a computer to update your iPhone.
This is described in the linked articles:
Update your iPhone, iPad, or iPod touch - Apple Support
If you need more space for an update on your iPhone, iPad, or iPod touch