Is it possible to install a custom ringtone on an iPhone running iOS 11 using iTunes 12.7 or later? If so, how?
Yes. You can manually drag your ringtones into the device connected with iTunes.
I confirm the answer by Cykor: once installed the iTunes 12.7 version, and with a device connected, there is no more a "Ringtones" section under the selected device; but dragging a .m4r file over the device sends that file to the device. That file will be usable as a ringtone for any event or contact. If the file is not the correct format or size (too long, for example) an error window will appear.
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protected by Community♦ Sep 15 '17 at 23:03
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