You can export your project to Dropbox and it will be saved in a special format .h3d (this format used only by our application.)
You can import your project from Dropbox back to the application and it will continue to work. Files of other formats can not be imported.
You can add a picture with the scheme of your apartment as a background on the screen Layout. To do this, click "Background" on toolbar of screen Layout. Now you can add rooms and create a copy of your apartment.