You can't set the article to be responsive. Only the HTML that the article is displaying. In the case of HTML, think of the article as a frame or container for the HTML.Can you post screenshots of what your article looks like in each orientation? Are you saying that the HTML looks "sideways" when yo...
InDesign and DPS Classic (2014) would let you assign two separate inDesign layouts as the sources for the Vertical and Horizontal displays for the same article. This no longer works in DPS 2015 (2016?)HTML can be set up as responsive, which means that one HTML layout can "respond" to how it is being...