Dodge RAM 2016 Owner's Manual page 185

To enter USB mode, you must push the SRC button.
When you enter USB mode, the display shows LOAD-
ING while the radio checks whether the connected
device is valid.
If there is no USB device, an invalid USB device, or a
valid device that is defective, the display will show ERR
USB for two seconds and the radio remains in TUNER
mode. If a valid device does not contain any playable
files (i.e. MP3, WMA or AAC), the display will show NO
MUSIC for two seconds and the radio remains in
TUNER mode.
UNDERSTANDING YOUR INSTRUMENT PANEL 183
If playable files are found, the radio will also check that
the connected device is the same as the one used imme-
diately before the USB function. If this is the case, music
playback will start from the point where it was inter-
rupted (file and music runtime). If not, the file played
will be the first valid file, in the sequence shown in the
following example:
I n f o r ma t i o n P r o v i d e d b y :
4