(Byd han 2024 ev) Can someone explain this rattling sound from the back

I'd guess something on the speaker, like a loose bolt. Had one in my Seal dashboard speaker.

Check the rear seatbelts, they might just be rattling against the door

I can’t really hear anything out of ordinary, if it’s that sound that is in the video it’s usually plastic panels or leather interior on the bumps mine does that as well especially in cold weather