Make embedded audio InDesign's EPUB3 files fully compatible with Google Play Books platform
Embedded audio in EPUB3 documents created with InDesign is not recognised when the EPUB3 document is published via the Google Play Books platform. This is due to incompatible ID tags. InDesign exports this:
but Google Play Books requires:
IDs must start with a letter ([A-Z,a-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".")
Currently this makes it impossible to use InDesign to create an EPUB3 with embedded audio and publish it correctly via the Google Play Books platform.