I am getting the following error message
"Download Error
Sound files must have one of the following extensions: mp3, arc, ac3, mp4, m4a, air, tiff, can, wav, File:_0342_1Sm4a"
This is an intermittent error. It doesn't happen normally. I create my deck on my iPad and add audio files to my cards. I then export my deck to the app server. I then try to download the deck to my iPhone from the app server. This download generates the above error message.
Usually this process works well but sometimes I get this error and cannot download to my iPhone. I don't want to have recreate the deck from scratch. How to I fix this?