Mobile app Android (kotlin) + Exoplayer

I have an Android app in Kotlin with the Exoplayer library that plays mp3 from a server and the job consists of adding the functionality of downloading the audios using Exoplayer while the user listens to it. When the audio is downloaded it automatically plays the audio from local instead of from the server.

From the menu you can delete the downloaded audios and then the playback will be from the server again.

The user will receive a notification: "downloading audio" and "audio downloaded"

This is the Exoplayer functionality to add: https://exoplayer.dev/downloading-media.html