Multiple versions of the same folio designed for different devices are called renditions. If you create multiple folio renditions, the viewer makes available only the rendition that most closely matches the device’s dimensions.
Renditions are especially useful for three reasons:
- To create iPhone content that is not letterboxed. For example, you can create a 480x320 rendition that works on iPhone 3/4 devices and a 1136x640 rendition that fills the display area of iPhone 5 and later devices.
- To create a Web Viewer Only folio. See Customizing the Web Viewer.
- To create folios for Android devices that require less scaling and letterboxing, or that target different device sizes.
Renditions are available only for multi-folio apps. If you're creating a single-folio app, folio renditions are not supported. Instead, create multi-rendition articles.
Using the same Folio Name for multiple folios ties them together as a set of renditions. While Folio Name values for the different renditions must be the same, the Size values must be different (except for a Web Viewer Only rendition). In addition, if the folio renditions belong to a retail app, we recommend that you use the same Product ID for all renditions (but use different Product IDs for different sets of renditions). For renditions in a subscription app, the Publication Date values must be identical—choose the date from the calendar widget.