ah thanks for the help! So I now also got the PreloadZip() method to work on pc and mac by setting up CORS for the S3 bucket, but neither of the methods works on ios. It shows an empty screen instead of the pictures and doesn’t play the audio file (just like you guessed). It’s really frustrating because when I try out the experiment from this forum post on my ipad, it works perfectly and plays audio just fine!
I am planning to take the ipad to some kindergartens and run the experiment with children, so I really have to get it to work on a tablet. Worst case scenario I’ll try out an android tablet I guess. Is there no known ios workaround for playing audio?