Change in USB flash drive directory not recognized by WDTV Live

My technique for watching is pretty simple; I have a 32GB USB stick and I copy the video file to it from my Mac and then take it and plug it into the WDTV.  The problem is that the WDTV does not recognize the new file that’s been copied to the stick; only shows the files from before.  Media Library is off.  Is there a way to force the WDTV to update what it’s seeing on the stick so it sees the most recently added files?

Did you check if the new file that you are trying to play is compatible?