The Power BI mobile application embraces much of the core functionality of reports on the Power BI Report Server, with some limitations. Users will be able to view and interact with reports, but certain advanced capabilities available on a desktop may cause them to need help working seamlessly on mobile devices. For instance, a feature requiring heavy processing will not render effectively, as will certain custom visuals.
In addition, this app has touch-based navigation features that will change the nature of some interactive controls, such as slicers or drill-through actions, which may function differently. Such layouts and reports may not support certain customizations that were meant to be deployed on a larger screen.
To have a smoother experience, it is best to have the reports tried and tested in the mobile app and then make reports mobile-friendly when designing. This is to ascertain that all the functional and visual components critical to mobile user experience are active and accessible.