1) Download and install "bluetooth download manager" on you Xperia
After the device is paired with PC, Mac etc. click bluetooth -> send file
2) There is a tiny little icon in the top left ( on the Experia) hand corner of the home screen.
3) Drag down on the screen , then hit the files that you are trying to transfer
4)You will see where to accept incoming file transfers there. Click "accept"
5) In Bluetooth file manager find "Bluetooth" folder, that is where the files are (just did some pictures and 32Mb of *.Mp4 - works fine