A: The preview function was intended to preview Flash presentations built in the Editor in the Manager. While it may work for many HTML5 presentations, not all functionality in the presentation will work, such as gestures and swipes.
Menus might behave differently and colors differ. This is why we advise agencies never to rely on the preview to assess if the changes they are making while developing are OK. For this, one should always run it on the device on which it was intended; the iPad.
The problem with the browsers and the reason for being unable to see the presentation in browsers such as Firefox and Internet Explorer, may lay with the way the presentation was built. Most developers will take which platform it should be used on in to consideration. In this case Mobile Safari. To include all browsers would take extra time and testing, so skipping this phase is most likely the cause for incompatibility.