Safari documents and data uses 60GB?????

So I recently decided to post on YouTube on my iPhone 16, posting about 55-60GB of files to YouTube online. After that I started to notice performance issues, but after restarting it was fine. I then checked my iPhones storage and saw that Safari uses 60GB??? I read online and found out that it was indeed because of the YouTube posting. But I’m curious, HOW DO YOU DELETE THESE DOCUMENTS AND DATA???

(I really need this 60GB of wasted storage for other things, so somebody PLEASE HELP!!)