Ringtone purchases
I purchased a ringtone song but I am not able to set it
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If you have puchased a ringtone, follow all the steps and instructions in -> Use tones and ringtones with your iPhone, iPad, or iPod touch -> Use tones and ringtones with your iPhone or iPad - Apple Support
If you have puchased a song & want to use as a ringtone, you must first make that song suitable for a ringtone.
See this Apple article: Create and manage ringtones
Create and manage ringtones - Apple Community