App store not available

Hi guys.

I have nextcloud installed on a raspberry pi machine. The machine runs Ubuntu and nextcloud is installed via snap. It seems to me that my installation has no access to the app store. I see that there are only a few apps that I can install enable and there are some that I see in the app store and not on my server (for example, the mail one, or the deck one).

I’ve searched in the forum and in the documentation, and I didn’t see how/where I turn on that feature.

What did I miss?