Customize Ringtone for a Contact

[sreekumarssk]

Hi all, I'm using Lumua 850xl and I want to set a customize ringtone for a contact. When I go to contacts then edit then in ringtones I can find only systems preloaded ringtones and I'm not finding the ringtones which I've added to the ringtone folder. But the same is showing in settings. Please suggest

 

[raycpl]

What's a 850XL?
A Honjo??

... !