S9+ Individual contact ringtones - no more option

I've just gotten the s9+ and trying to assign a different ringtone to individual contacts. I've searched online and everywhere is saying to go to contact, details, edit, more, ringtone. Except on my phone it is only allowing me to get as far as edit. Once I click edit in a contact it only allows me to edit the details of the contact such as phone number and name.

Any ideas as to why this is and how I can change it?

Thank you!

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