We can see here that based on the audio, Paola was actually wearing: Unos zapatos negros.
What is an audio?
Audio refers to sound, typically in the form of spoken words, music, or any other type of sound that is transmitted or recorded. It is the representation of sound waves in an electronic format that can be heard by the human ear.
We can see that the audio in question actually refers to the description of what Paola was putting on. In the audio, we hear that Paola is putting on black shoes. Thus, we conclude that Paola was wearing "Unos zapatos negros" which is black shoes.