In order to make use of certain page templates in M Theater, you’ll need to choose a Category of media files to display on your page of content. Two of the templates that require this additional field are the ‘Display Category of Media Files’ and ‘Image Category Slider’ templates.
To add your selected Category, use the ‘Custom Fields’ meatball, usually located just below the main content writing area on the ‘Add New Post’ window.
Add a Custom Field called ‘my_display_category’ with the Value of the selected category’s ‘Slug’. The ‘Slug’ can be found on the main Categories creation and edit window. The screenshot example below shows the format for creating the custom field.