Why is the resolution of the video I created lower than that of the iPad’s camera?

Why is the resolution of the video I created lower than that of the iPad’s camera?

When sharing a video via social media channels and email, iOS currently reduces the video quality to make it smaller and easier to transmit. If you would like to work with the original high definition version of the video, you will need to export the video to your albums from myCreate and then transfer the movie from your albums to your computer directly.