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BoldGrid, like other sites built using the WordPress framework, automatically generates site content using the database. So, the actual content is stored in that database and 'turned into' the site itself!
Beyond that, there are folders for media and content in the WordPress/BoldGrid file structure. These are where pictures, videos, and other media files are stored. You can get a better look at them in the cPanel file manager.
If you have any more specific questions, please get in touch with our 24/7 Technical Support team directly and they can help you find anything in particular you are looking for on your site!