Can't use a file stored in my Mac as a ringtone

**UPDATE** : Changed the title of the question, since I realized that the current title is a bit misleading. I have: - iPhone 14 Pro Max running iOS 17.3 - Garage Band on the iPhone has version 2.3.15 I have on my MacBook an .m4r file (which I had created from a WAV file using the online converter www.zamzar.com), which I now want to use as ringtone on the iPhone. I already copied the file to iCloud Drive, and I can see and play the file on my iPhone. I found that this guide at fonetool.com supposedly describes the whole process. Basically, it requires that after having copyed the file to iCloud Drive, I need to use the Garage Band app on the iphone to make it suitable as ringtone file. The file is in the Downloads directory of iCloud Drive. Tapping on the file from the iPhone File Manager allows me to play the sound file, so to this point the .m4r file on the iPhone looks okay. Then the instruction say that for using it as ringtone, I should open Garage Band on the iPhone and tap on "TRACKS". However there is no _TRACKS_ to be seen after opening Garage Band. Actually, the starting screen on Garbage Band looks completely different from what has been posted in the fonetool.com guide which I linked above. Instead of seing on top of the sceen, my Garage Band app shows an iCloud Drive file browser after starting it up. Inside this browser, I *can* navigate to the Downloads directory, and I see there my .m4r file, but the is greyed out and can not be selected. What can I do now to get things done? Perhaps the guide at fonetool.com was written with a different Garage Band version in mind?