Thanks a lot for the quick answer. I just tried the web browser but with no avail. First I thought that it is a problem with the micro SD card and changed it to another one. But also the other SD card did not help. When I eject the SD card I can see the videos on my computer without any problem. But in the app or in the web browser the videos just don't show up although the settings are right. I then reinstalled the app and this did the trick. Don't know why but I very much appreciate the solution. Many thanks again!