In the Gallery, you can use these gestures to manage your drawings:
1. To add a new drawing, tap the + in the upper left corner of the status bar and select New Drawing, or tap the + at the bottom of the screen.
2. Swipe up and down to scroll through the drawings in a project. Tap+hold a drawing to bring up the copy/delete popup. Tap copy to create a duplicate, or tap delete to permanently delete your sketch.
3. Tap the project title in the upper status bar for a drop-down list of all of your projects. Tap a project in the list to move straight to it.
4. Tap+hold+drag to move drawings.  You can add them into a different project by opening the project menu and dragging them onto the project title.