Hi Thomas,
Thank you for posting in Apple Support Communities.
It’s fun when we customize our ringtones and we’re happy to help. If you bought the ringtone from the iTunes Store you should have seen the option to put the ringtone for default, text, etc. Did you see and select an option?
If you don’t see your ringtone anywhere, take a look at “Redownload tones purchased with your Apple ID” found in Get ringtones, text tones, and alert tones in the iTunes Store on iPhone.
Reach back if you still need help.
Have a great weekend!