Hi, Trialling Poweramp because it plays all formats. It's not playing all .m4a files but playing some! I uploaded all my music files into my new (Android) Asus Zenfone (onto the micro SD card as there is too much music to fit on the phone's internal memory) and I can confirm the files are all there (checked file manager on phone plus connected to computer with cable and checked in Windows Explorer). At first I thought the .m4a files weren't playing at all, but here's a weird thing - All the .m4s files were missing, but then when I turned my phone on a couple of days later and was searchi