What is the significance of the “Metadata Identifier:urn:uuid:####….” when exporting an InDesign file to ePub format? Should I change it or leave it alone? Thanks!
You must use a unic identifier. Years ago, I overwrite this with the ISBN, but if you crack up your EPUB, then you will see, that this isn’t correct. Today I leave it as it is and do not include a addtional ISBN. Therefore I can use the EPUB for Kindle (>mobi) and iBooks.