Hi Nick,Great that you are using the HTML Packager tool !This will transform your html files in a .article format which you need in order to upload content DPS 2015.What you will need to do is just drag and drop and html file in the HTML Packager and that's it ! is that simple/So, there aren't any problems .More on this and how to create the .article with this tool, I recommend consulting the below article :Digital Publishing Solution Help | Create HTML articles for DPS 2015Thanks,Andrei