Finally I could solve the problem and the magazine was published last 16th of July. You were right was something about the codecs. I use Premiere and when I exported I followed your instructions, the problem is that the program didn't do it. But, in the end I found a way to see the codec information and I could create a video with the correct codec that is visible on iPad Air.
But, thank you very much for your search, and I would see if you file works.
It's good to know different solutions to one problem.