Bit bemused as to what app is being downloaded? But iif it works for you!
You should just need to download the ringtone I uploaded.
This goes onto the Samsung S8 (same as me)
When you go to ringtones there is a + at the top right. this should be where it is. Listed as 3XXF
I think I know what is wrong, T.
I should have said that when your list of Ring Tones comes up, there will be an Add ( +) option at the bottom.
Click on that and it will ask where you want to upload from and give you some options....you just click on the tab for the original App in the OP then do the 7XXF or whatever it is and you should be sorted.
Let me know