General File manger's won't transfer files properly

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http://androidforums.com – Hi all, I'm just having some issues with using various file mangers to transfer files within my Nexus's SD card. Basically the files don't seem to transfer correctly. Example: When I transfer a file from "ringtones" into my "music" folder it still doesn't show up in the "play music" app. And when I connect my phone to my computer I find the same song still stuck in the "ringtones" folder. When I transfer from "ringtones" into "music" folder with my computer (using data cable) it works perfectly fine and I can find the relevant (General)