Some videos are best accompanied by additional resources - examples include nutrition guides, educational slideshows, printable instructions. That's where extras come into play and to get started you'll create an extras library.
Extras are found under the Content > Extras tab and later associated with specific videos or collections.
Navigate to Content > Extras and simply drag and drop your files over(you can do multiples at a time) and they'll be added to your extras library.
Once extras have been assigned to a video, collection, or live event, they will be visible to customers under the Resources tab on the relevant page: