I think you just have to be careful of the time stamps. Note that the aircraft apparently ignores DST, so the times are all an hour off. My first attempt bounced too, but then it dawned on me I should not send the youngest file. That is from powering the AC when attaching to my Mac. I needed the next to the last file, to actually represent a flight <duh!>. So I tried it again, flew around my driveway for 5 minutes or so, about 56MB. Hopefully this file will pass muster. I deleted all the others, so only one present now.