Questions After Setup

[cassinni]

Hi,

i got a few questions after setting up my cell.

1. What is the fingerprint sensor suppost to do?
It just shows the lockscreen but does not unlock it for me.

2. I can connect the cell to my car Bluetooth but it won't
show the music i got on the phone. Worked perfect with Samsung Note.
What do I do wrong?

3. Why do I have to select "file transfer" everytime when I connect
the cell to the pc? Where can I always enable that setting?

Thanks