Custom ringtone made on iMac doesn't import to iPhone
I made a custom ringtone on my M1 iMac macOs 11.4, but i haven't been able to download it to my ringtone library on my iPhone XS iOS 14.6. I converted a 20 sec. clip of a song in my Music library from .m4a to .m4r. Nothing I have tried seems to add it to my ringtone library on the iPhone. The various tutorials on the web haven't been helpful. Any help would be appreciated.
iPhone XS