I just got into the ebook technology last week. I found this amazing app which allow us to add read aloud to an epub. I created an epub with read aloud feature by following the tutorial.
The read aloud works perfectly on Apple Books and Kobo. When I upload the same epub onto Google Play Books, it doesn't play the narration of the read aloud. I received the error message, "Can't play the audio narration for this book. Check your internet connection." when opened the epub on Play Books app. I also checked the epub with epubchecker, it returned no file error.