To do this, in the Solution Explorer, open the context menu of the website template folder and click Upload Template.
This uploads the website template to your site, register the master pages as page templates, and register all themes located in the App_Themes folder.
IMPORTANT: All master pages in a single website template must have unique file names.
NOTE: You cannot delete a website template that is currently in use.
A website template is in use in the following cases:
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