v8.5 and above:
Please go to the “Sequence” tab. In the grid view, please expand the menu and select “Export”. In the gallery view, please tap the “Export" icon.
Select “Videos” as your export format. Pick an aspect of ration. The app will trim the screens to make the video fit in the aspect ratio selected.
Videos will be saved in your photo library. You can also open the videos within other apps.