You can export your file in two different ways - you can send it to yourself via Email or you can export it to your Arthur Drive.
1. Open the context menu by long-pressing the Menu-button while aiming at the file.
2. Click on "Export"
3. Export to Email: Click on Export → Email File
This file is now sent to your email address (associated to your Arthur account)
Export To Arthur Drive: Click on Export → Arthur Drive
To access your Arthur Drive, go the Arthur Portal on your computer for Professional or Consumer version.