I opened the audio file in Audacity and immediately exported it as MP3, which asked to replace the file and now the file works in MS. Apparently the file was corrupted just enough for MS to react, but not enough for anywhere else. Just another reason why MobileSheets is such a good app, from now on when that happens, I know it's a corrupted file and needs to be fixed.
Member Cali Rose & The CC Strummers; Bass Uke, Tenor Uke, Blues Harmonica, Tech Advisor