How to set a custom SMS ringtone for Aux M860 mobile phone

Let's go to official website. Such a question should have an answer.

My mobile phone is Samsung, and there are four folders in the memory card. There are ringtones, pictures, videos, etc. I usually put it according to that.

SMS ringtones that cannot be made in profile mode may not be modified.

When selling mobile phones in the past, some mobile phones could not be set up.

I hope my words can bring you some help.