Based on:
- most requested questions on help desks, in Growth team findings
- my personal experience interacting with newcomers as a volunteer
At the moment, when people want to add a photo to a page, they click Insert and then search for a way to insert a photo. Media is a too generic term, than can have multiple meanings in several languages (press...).
Have a clear label that matches what people are looking for would certainly help newcomers to achieve their goals, or, at least, facilitate it.