Hi all, I'm a newbie to this site and indeed to drone flying, I recently purchase a refurbished Phantom 4 and really happy with it, only thing is I have taken a few videos and still shots and I have found 70 to 90% of the shots I have taken will not open on my PC, instead they return the following comments: "file not supported", "file corrupt", "file missing" or similar yet others open without a problem,. I have tried other cards including the original one that came with it. can anyone suggest what I might be doing wrong?? Marc