MacOS: Change New Mail tone?

[tokyotony]

Is it even possible to change the new mail tone in Mac Mail? I opened the Mail package and tried to move into Resources folder an aif file, but it doesn’t let me.

[Gothelf]

If on a Mac: Mail/Preferences/General/New messages sound

[tokyotony]

Thanks but that only let’s you select specific ones. I want to add one to the list.

[PHolder]

Not a Mac user. Can your replace an existing one with a custom one?

[tokyotony]

I try but it gives me a “Do NOT” symbol when I drag the file into the folder.