Adobe Digital Publishing Suite - Manual (Page 64)

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You can also create a smooth scrolling article by importing it. Create _h and _v source files and use the Import Article option. See Import InDesign
articles.
Smooth scrolling works only vertically at this time. To scroll an article horizontally, you can create a scrollable frame. See Scrollable frame
overlays.
To adjust the size of the smooth scrolling page, use the Page tool to select the page, and then adjust the page’s height.
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