Click Use the Add Model Wizard 
. In the Wizard dialog box,
do the following:
Click Browse to locate the .zip file.
Click Next.
Select the primary model file name you want assigned to the model.
Go to: Model tab>Add New Model>Use the Add Model Wizard
With the Add Model Wizard:
Add multiple files into one .zip file.
Assign model names and .zip file names that are not identical.
To add a model using the Add Model Wizard:
On the left panel, select a category to add the file to that category.
If you do not select a category, the new .zip file is added at the root level (beneath the current catalog).
On the right panel, click Add New Model.
Click Use the Add Model Wizard . In the Wizard dialog box,
do the following:
Click Browse to locate the .zip file.
Click Next.
Select the primary model file name you want assigned to the model.
If the .zip
file contains a single model, the system defaults to the name of the model.
If the .zip file contains multiple
files, you can select any of the file names listed as the top level, representing
the items added to the category. Only the top level model is displayed
in the preview and in the Attributes
dialog box.
Click Next.
To add multiple files, you can use the Publish Models process which can batch upload model files from a specified folder.
To install the Publish Models tool:
Log in to 3D Content Manager.
In the Address line, after http://www.3dpublisher.net/3DContentManager/ type publishmodels.html.
Click Yes in the Security Warning dialog box.
Follow the Publish Models install wizard.