Yep, you are right, my answer was not clear.
I have an account at Bunny CDN with several sites and most of them are using WP Fastest Cache where I simply add “mysite.b-cdn.net” and then it works – meaning that when I check the URL of any random image of the site I get this same https:/mysite.b-cdn.net/…/image.jpg
For 2 different sites I wanted to switch from WPFC to Super Cache for different reasons not relating to the CDN and then tried to connect to my CDN accounts by testing differing leading strings and no ending slash. None of them worked – meaning that I never succeeded in getting Bunny’s URL for loading images and was still getting the usual https://mysite.com/… This is what I call “not working”.
I then switched to W3 Total Cache for those sites and they connect to Bunny CDN by using my account’s key and found this much more straight forward than messing with leading or ending characters whatsoever. But again, the problem here was that I really didn’t find any sort of way to connect and load images from my CDN account at Bunny.
Thanks for your interest.