Originally Posted by
VZWRocks Astro or any other file manager will do the trick.
Copy to
/system/media/ringtones
Astro will open to the root of /sdcard and your ringtones should be in a folder inside that; you will have to navigate down to the root file system.
You mean /system/media/audio/ringtones

!
I'm giving this a shot myself as I'm suffering from the same error. I like my g/f and some friends/family to have a different ringer and the ones I've been assigning haven't been sticking.