AWS ssl certificate and snappy nextcloud - how to redirect to https?

Greetings everyone,

Found the snappy package extremely straightforward to set up initially. However, I’m struggling with figuring out, how to force nextcloud to redirect from http to https. My ec2 instance is behind a load balancer, which listens on both ports. So I can access my nextcloud via http as well as https.
I can’t seem to find a way to edit the snap config file (or an appropriate command) to serve the site via https.

Interested to know if anyone stumbled upon the same situation. Any help and advice will be greatly appreciated.