Made 6 custom ringtones on my computer, all variants of the same song. Converted them to m4r's and tried transferring from Mac to iPhone like normal. 4 of them transferred fine, but 2 won't transfer no matter what. These 2 are the same format, bitrate, etc as the rest, and are 35 seconds each (the others were 37 seconds), so I have no idea why they won't transfer. I have plenty of storage on the phone. Any thoughts?