Dropcards does it's best to make sure every card has it's media associated, but we do not upload your content. With so many cards, and so many drop dates, it's important that you make sure your cards have your content on them when you want them to. You can upload, disable, and bundle your media any which way you choose. This can be easily updated in your Dropcards account, via the Media Library section.
If you need help setting up your content, feel free to call us and we'll walk you through it.