How to add or change system ringtone on Sony Z3

Now download the ringtones to the phone, and then restart the phone, because walkman cannot detect the new songs on the phone without restarting, then open the phone settings, click on sound, click on ringtones, Then click on the note in the upper right corner, you will jump to the walkman interface, then find the ringtone you want to set, set it and it will be OK

I hope my answer can solve your problem, hope to adopt it