Weird Sound from the rear of vehicle

Hello,

I am hoping someone here can point me in the right direction of what I should look for in regards to the issue I am dealing with. I will include photo and videos as well as a description of what I have done so far.

I have a 2014 BMW 328i and when I accelerate the vehicle I can hear a noise coming from the rear of the vehicle on the right side. When I allow the vehicle to coast, the sound goes away and at certain speeds when you lightly press the gas it does not make the sound.

I took it to a BMW dealership in Miami and they told me it was the differential. He stated that it is leaking and needs to be replaced. I informed him that it was not leaking as there was no sign in my drive way of oil coming from it and that the oil he saw on the differential was from me checking the color of the oil and touching the differential with my gloves. So I do not know if I truly trust his diagnosis.

While in Charlotte two days later, I took it to Firestone to have them replace the wheels. They took a look at it and they believe it is the hub or the wheel bearing. When they manually spin the wheel, it makes a sound like a flat wheel or something flapping.

From the information I have supplied does anyone know what I should look at to find out where the noise is coming from? Thanks

When I took the wheel off today, the piece circled was disconnected and I pushed it back in. I wanted to include this information in case it matter.
https://photos.app.goo.gl/5rPTrxAmVh9MVFVj8

Sound from inside car:

Sound from outside the car: (Suggest headphones or turning speakers up)

Topic