Wav files do not play on iPhone XS

[NyanHelsing]

https://osf.io/fehvs/ as an example wav file. If you try to play this on an iphone XS, see the attached screecap.

[NyanHelsing]

As a side note, wav files are large. something to consider would be converting sound files to a lighter format rendering, just like images are all rendered as jpegs by MFR. This would resolve this issue for IE also #141