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Why can't i change my mms tone
Hi @Lisajane, welcome to our forum!
Is it resetting back to a default one, or are you not finding the option where you can change it?
The option to change the notification tone can be found in Settings > Apps & notifications > Messages > Notifications > Other notifications > Sound > change to your preferred tone.
I hope that helps! 
I am also having this problem. I have followed the steps above but I don't seem to have all the options that you have given for me to follow
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Hi @Peter1606!
Could you try and go to Settings > Apps & notifications > Messaging > App notifications > tap on "Messages" below the categories text > Sound > change to the tone you want.
Let me know if that makes any difference! 
Hi Jonas, I don't have anything saying messaging in the apps and notifications in the settings menu
Hi again @Peter1606!
My bad! You will need to tap on "App info" first. You will then see a list of all your applications and you can scroll down and find the messaging application (Messaging or Messages).
Sorry for the lack of instructions!