Storyline 3 file no sound on iphone 6 Plus

Ok, I have a sound issue with Storyline output for IPhone 6 Plus. 

I output in HTML5.

no problem with sound on desktop, using Chrome, Ipad

on iPhone, can't get any sound when I play the modules. Tested using Safari and Chrome. 

So problem is using. iPhone 6S, IOS 10.0.2

output from latest Storyline 3 version update 1: 3.1.12115.0

anybody got any ideas on what might be causing that. 

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