How to free up space on system storage

Clear Other storage on your iPhone or iPad - Apple Support

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

Edit: A three or four hour

Ncyarbr Said:

“How to free up space on your system storage”

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Delete Items you do not Need.

If you are concerned with space, then rid of media files - particularly, TV Shows and Movies.

A three or 6 hour long movie may be 4GB or so. And, if you sum up all the space - it’s quite a bit.

Take it in perspective: With 25 movies of that size, you’d have 100GB - quite a bit of space that could be used for things that you need.