Why won't my music files play on my LG G3 ?

[AC Question]

I transferred my music files from my mac to my usb device and then from the usb to my LG g3 when i disconnect my usb device i can see the files but they won't play

 

[Rukbat]

Are you sure you copied the files, not shortcuts to them?

What kind of files are they (the part to the right of the rightmost '.' in the name)? If you don't have an app to play that kind of file, remember that phones don't play files, apps do.