App Store Not Shown

I installed Nextcloud using Docker on Ubuntu 18.04 server. It works fine. However, the app store is not available. It doesn’t appear anywhere. How can I turn on the app store?

Dustin

as there are almost none infos about your server, environment, setup, etc all i can do from here is: please use the :mag: searchfunction of this forum as there are several threads about app stores.

good luck