use the sync cable that comes with the phone and use the desktop manager software to add songs in the device memory or memory card if any. Bluetooth transfers arent always successful. Or downloads over the air. I know from past experience that it is better to just use the sync cable to transfer any info from a pc to the phone.
and btw, why are your 25sec ringtones so large in size? 625k? that is huge for a ringtone that short. Mines go at around 200kb -250kb max.