how do I delete storage media from my iphone 13

It is beter to check the device storage, see this Apple articles below:

If you need more space for an update on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT203097

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

https://support.apple.com/en-gb/HT201656

Clear Other storage on your iPhone or iPad

https://support.apple.com/en-us/HT211686

What's the difference between device storage and iCloud storage?

https://support.apple.com/en-us/HT206504

What I personally do to clear some space on iPhone is delete cache from social media apps like Facebook, Instagram, Twitter, and so on. Because these platforms have lots of media files.

[Link Edited by Moderator]