Bucket url

I currently have public access through custom domain that is able to access my files.
For example if someone goes to

r2.leaguesounds.com/test.ogg

r2.leaguesounds.com/test.ogg

r2.leaguesounds.com/test.ogg

r2.leaguesounds.com/test.ogg it'll automatically download it.
How can i have a url like this for use in an app in an audio

src

src

src

src for example, but have it be private so no one can go to that link and download it?
Or any recommendations?