Black Box NL600 User Manual page 20

Note:Please adjust video volume on display menu panel when plug HDMI cable.
Video progress bar, drag the slider directly to adjust fast
forward and fast backward.
The former is for present video playing time ,and the latter is for
Video total duration.
Click enter into the list of the files ,that is the interface as below,
You can add multiple files on the list interface ,below the green font bar
that displays the number of the add files.