Thanks for your reply and your concern, @ThisIsMissEm 
I already mentioned at the first entry of this thread (bottom of the message) that Heroku is not free anymore but yet is still a very useful tool for developers to publish Proof Of Concepts and other experiments. It’s OK to have a prototype running on your local machine but as soon as you want to validate with colleagues you need to deploy your ideas to Real Life and that sometimes is not trivial. I would like to hear more about alternatives to Heroku that are free to use, but anyway that wasn’t the point of this thread.
I wanted to confirm, as said in (Music Platform) that is possible to run an instance of Community Server with “mashlib” configuration and access files and content in a public way, without being logged in (Music Platform - #8 by ThisIsMissEm).
I’m not sure if I really managed it, you can have a look if you have time to this:
- https://warm-inlet-30289.herokuapp.com/
- https://solidwebapp-7a3cf.web.app/
- GitHub - fan-droide/solidclientwebapp: An example of SOLID client Web App to access Community Server resources
There’s still some work in progress but probably I’ll continue in the Music App thread (Music Platform) with final thoughts.
PS. Regarding Heroku persistent disk storage, I have no idea, sorry, I’ll need to dig a bit more on it but it’s not relevant for the prototype at this point.
Thanks again for your support!