[knt]

There are no silly questions.

This how to might help

 

[knt]

Could be it needs a software update

BMW Software Update | BMW.com

The BMW Software Update ensures that the software of your mobile devices and your BMW always keep pace with the latest advances.

www.bmw.com

 

[knt]

OK, the next questions are

Does the system have internal storage (i.e HDD) as not all system have internal storage system?

Does the mp3's need to be in a specific bitrate to be able to transfer to internal storage?

 

[knt]

If it has sat nav and no DVDs are used then I guess it'll be HDD based.

If you just recently purchased the car might be worth asking the dealers to show you. Hopefully they won't charge for this.

 

[knt]

Might be worth trying another make/model USB flash drive.