Our developers are working on it. Sorry for the inconvenience and thanks for your patience. Currently I'd suggest you to reboot your device and try again.
Nothing helps. Even uninstalling the application and reinstalling it. However, I noticed that if I import a video taken from my iphone's camera then it works. But this does not apply with the videos taken from P4.
The same problem on iPhone 6s plus 128GB. Total size remaining 39GB. Latest software. Install and uninstall procedures does nothing. Very frustrating problem.
Any solution ?