Try clearing your Website Data and History One way of easily clearing some of this other storage or system data on your device is to clear your website data and history, this can be done in Safari.

If other storage is taking up space on your iPhone, I’m going to show you three simple ways to delete other storage on any iPhone. First, open the Settings app, click on general and click iPhone ...

If your iPhone’s storage has been consumed by content mysteriously labeled as Other, we’ll show you how to take care of it and reclaim your device’s space.

These are various ways to clear your iPhone's storage, and if they don't work, you can try deleting what's known as the "Other" storage.