Not enough iphone storage to download IOS update
How do I clear 'other system storage' eg caches to allow room for IOS update
iPhone 7, iOS 13
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How to check the storage on your iPhone, iPad, and iPod touch - Apple Support - http://support.apple.com/HT201656 - "About cached files in Other ... Your device automatically removes cached files and temporary files when your device needs more space."
How to Clear "Other" in your iPhone's Storage - Use Backup
https://discussions.apple.com/docs/DOC-250002774
Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch
https://support.apple.com/HT201265
The first link also provides tips about if your device is low on storage, iOS can automatically optimize its available space while installing an app, updating iOS, downloading music, recording videos, and more.