Which DPS subscription do you have : CCM/Professional/Enterprise or Single Edition?
Multiple edition :-)
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OK then you do not have to export the folio. For Multi Folio Apps, publish as Public from Folio producer and use your folio producer id as Title id in DPS App Builder/Viewer Builder. Use renditions to publish iPad 2 and iPad 3 folios if you have already built those, else use the new pdf single format option which works great on both retina and non-retina display iPads.
Then complete your Build using APP builder. For multi issue apps, your folios are hosted by Adobe thus once you download the App, individual folios are separately downloaded directly from Adobe's Servers. Concept of exporting the folio is applicable in case of built in single issues and Single edition workflow.