Deleting is the only way to fully wipe local cache, but both methods can clear temporary files and free up space. Open Settings > General > iPad Storage. You'll see a list of apps and how much space ...
When clicking on System Data, the very last thing on the iPhone Storage settings page where all your apps and their file ...
When an iPhone suddenly refuses to install a new app or take another photo, the culprit is often a mysterious bar in Settings ...