Im not a pro either i've only messed with it a little bit. 😅 But from what I remember you can encode data into audio and then hide that audio in a "public" bit of audio that you could share anywhere. Like a song you really like or a ring tone. You can encode things above or below the human audible ranges or "broad spectrum" if you wanna be really sneaky lol. Then you or the intended recipient could decode the info at a later date.

My knowledge drops off a lot here but i'm guessing there are ways to detect irregularitys in audio files if you scrutinize it programmaticly. But I think someone would have to suspect that you are hiding something in audio to take a closer look at all your audio files.