To share a project between two different platforms you will need to buy both versions of HD3D app : http://www.homedesign3d.net/EN/platforms
About sharing project :
-First, check the versions of the applications, it is recommended to install the available updates, however beware Home Design 3D can open a file only if it was created with a lower or equal version than used.
-To share the project use the « share » button, at top of screen, select send by email or with an App (iCloud, Dropbox etc..)
-By email simply open the file by clic on it in the other device.
-By Dropbox follow these steps :
1 Click on the desired project (.hd3d)
2 Click on the 3 small dots on the top right
3 Click on "Export"
4 Click on "Open in ..."
5 Click on "Copy to Home Design"
(Note: special characters in project names are deprecated because they can block file sharing).
On iOS, if Home design 3D is not available in list of compatible apps follow the steps above.
On Android, the device will show you the list of app you can use to open the project, then choose the Home Design 3D.
On PC and Mac, double click on the project to open it in Home Design 3D.