Your Pyware® version MUST be at least v9.3.1, v10.2.1, v11.3.5 or 3DX 1.0.7 in order to upload to the UDBapp servers.
UDBapp does not support Pyware® files created in Version 8 or older.
To check your Pyware® version, open Pyware® and look for the version number at the bottom of the splash screen as the program is starting up. You can also find your version by selecting the menu "Reference" and then "About Pyware 3D".
For more information about Pyware®, check out https://www.pyware.com/3d/