Samsung UN46ES7500FXZA E-Manual page 492

cannot be constructed because there
is no free space on the USB device,
you may not be able to view a new
file even if you have added the file to
the USB device.
Supported Devices
ΠCertain types of USB Digital camera
and audio devices may not be
compatible with this TV.
ΠAllShare Play supports only USB
Mass Storage Class (MSC) devices.