Missing Promoted Links app in root site

Hello All,

I'm working on an Intranet site for my organization.

It was created in SharePoint 2013 enterprise, with the site collection created using the publishing template.

Under the root site, i have 8 subsites.

In each of the subsites I can add the Promoted Links app by going to Settings >> Add an app.

However, I do not see the Promoted Links app in my root site in Settings >> Add an app.

Do I need to "enable" this app in my root site somehow? 

Thanks in advanced.

Albert