To begin, let's navigate to the Curated Content section of the dashboard.
You can Add New Category or add your files to an existing one.
Click on a Category > Subcategory to start.
Drag and drop files onto the window or click the 'here' link to select files from your computer.
Once you have selected the files, click Upload > Done to save them.
And that's how to add image, audio or PDF files!