Is there any way to make a file instance persist for all users in a website

I have a file which is around 1.2 GB size and I want to call an instance to it while formulating results for my website. Is it possible to make the instance the same for all users of the website? According to my understanding, for eg Heroku, as all create separate instances of the website for every user, is there any way to make it happen. I apologize in advance if the question is naive !!