Well it depends on the url. Usually shareable url where "anyone with the link may access that file" contain a random element that makes it hard to guess if you

Well it depends on the url. Usually shareable url where "anyone with the link may access that file" contain a random element that makes it hard to guess if you don't have it (e.g. an UUID). In other cases the content is at easily guessable path, and that is a whole different story