Wie kann ich eine .m4r Datei ins itunes importieren?

Ändere einfach den Suffix zu m4a, siehe auch: https://discussions.apple.com/thread/4419068?answerId=22240099022#22240099022

The ".m4r" is what makes it a ringtone so you do not want to change that or else it becomes just another very short music track. iTunes is very specific about the formatting for the file though and it has to be aac/m4

Another possibility is that it is being added but you simply are not finding it.

Oct. 2010 Getting ringtones folder to show in iTunes - https://discussions.apple.com/thread/2629494?answerId=12496240022#12496240022 - iTunes > Preferences. Under the General tab below Show, confirm Ringtones is selected