So I just got an SDS100 and am Using Sentinel for the first time. When trying to read from the scanner or write to the scanner I get the pop up window that says "Different on scanner" or "Different on unit" and then the 3 options to copy and replace, copy with new name or skip. I have only pressed the skip button as I am afraid of messing something up. Which is the correct choice here? Thanks for any replies and take it easy on me, I'm learning here lol.