Windows 10. iTunes 18.104.22.168.
I followed the directions found everywhere to create a new aac file less than 30 seconds long and rename it to .m4r then removing original (newly created) file from library. When dbl clicking the new .m4r file iTunes launches but nothing happens. I noticed that I have this same behavior with files already in my Tones folder which are a mixture of .m4r and m4a files.
The files play fine in other players such as groove.
It appears that I am now unable to import custom ringtones. Any ideas on what I may be doing wrong?