I reviewed some of the Timuu forks and one of them was working better. It seems that the problem is the theme does not reference the most up-to-date version of Persona theme. When I put persona.js file into the /lib folder the problem was solved.

So, if anyone wants to use the theme:

1. Make a fork
2. Copy up-to-date version of persona.js and autohiding.js files into the /lib folder of the theme

Solution:
Digital Ocean Spaces have some specifics e.g. they required the Endpoint parameter.
I've made my own plugin adapted to work with Digital Ocean Spaces. Feel free to use: https://github.com/zhivkoangelov/nodebb-plugin-s3-uploads-digitalocean

@PitaJ
Thanks, I managed to do it in the following way:
In the URI parameter I have added: ?tls=true&tlsCAFile=<path-to-the-file>

Issue resolved.

Hello,

I am installing NodeBB on Digital Ocean using Apps platform. I am trying to connect to MongoDB service, which requires TLS.
How can I setup (what settings to configure in config.json) for NodeBB to connect to Mongo using TLS and to pass a certificate file?

Thanks.