On your internal SD Card, check for the folder:
media\audio\ringtones
Create the folder(s) if necessary.
Drop your mp3 in the ringtones folder.
Now when you wish to change your ringtone, your OSF will see the folder and any files inside it and offer you the choice of any mp3 in there.
And you find the ringtones options by going to settings/Sound/Phone ringtone
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