It worked. The native viewer is working smoothly.
One last problem remains, by the way. It's not necessery for me to be solved, but maybe someone else will one day make a use of this:
A two time-object state-button isn't working on Android and Amazon Kindle. For example: I want a drop down-menu to appear in two states, a grey shadow (state 1), which turns into the menu (state 2). This feature is working fine on iOS, but on Android it stucks at state 1. Is the performance of the device not strong enough, to manage this? I can't solve it via the animation tool, because that won't work on Apple devices.