What are you using to make this app?
And how do you intend to convert InDesign content to an app?
What workflow are you expecting to use with InDesign to create an app? What version of InDesign?
There are specific workflows for enterprise or large publishers like Digital Publishing Solution (DPS2015) tools. If that's what you're using, ask in this forum:
Or, if you're using a third-party tool for creating an app, you'll need to tell us what it is.