Mercedes-Benz S-Class Cabriolet 2017 Owner's Manual page 334

USB devices
R
For details and a list of supported devices, visit
our website at http://www.mercedes-
benz.com/connect. Follow the instructions in
the "Media Interface" section.
Switching to Media Interface
Multimedia system:
Media à Media sources
, .
Connect a data storage medium to the USB
#
port ( page 327).
→
Multimedia system 331
Select a media device.
#
Playable music files are played back.