I now updated the extension to get the correct mime type for sound files. Also I updated the example project to get and set a ringtone, you can download it from the download folder. I also updated the documentation, see also the notes there App Inventor Extensions: Settings | Pura Vida Apps
Note: you will have to build the app before being able to get or set the ringtone, because the companion app does not offer the permission android.permission.WRITE_SETTINGS. Before testing make sure the target directory to copy the soundfiles to is empty. The target directory must be in shared storage. For more information see also the overview. The example project uses /Download/Sounds.
Taifun
