Audio/Video files embedded in Adobe Reader/Acrobat DC cannot be played on Mobile Android devices. (Audio/Video Embedded in Adobe Acrobat or Acrobat reader DC, as attachments in pdf documents).
Whereas these can be played easily on Desktops/Laptops in Adobe Reader/Acrobat DC
Sadly this feature is missing on Android Mobile devices though Google announced that there are around 2.5 billion active Android devices worldwide ( May, 2019)!
I feel the feature is very important with today's popularity of Mobile Phones, considering that they are even more powerful than the average home computers.
Adobe PDF format is popular for ebooks, documents etc and this feature would widen the horizons and scope of the format! For e.g.:
I encountered this problem when I wrote a religious ebook in PDF, regards the changes over the years,and inserted audios to remind how things were years back and the present scenario!
Unfortunately since it was not possible to play the audio files on Android, I had to revise the ebook with a note reminding of this shortcoming!
There are other potential uses like in Company annual reports/meetings, House magazines, Newsletters etc.
Historical books, Biograpies, Tourist Brochures etc.,etc. could have clips inserted to enhance the reading experience! In short the potential is endless! Maybe Adobe inc. will give this a thought!