You want to use this plugin Enable Media Replace
Simply install it then you will be able to replace media items with new ones.
It will also give you the option to keep the existing file name or update all links with the new filename.
You want to use this plugin Enable Media Replace
Simply install it then you will be able to replace media items with new ones.
It will also give you the option to keep the existing file name or update all links with the new filename.