Lost apps button into top-menu after restarting docker container


I have installed nextcloud in docker recently.
Then I installed all application I needed. Then I restarted docker container (compose down & up -d).
And all application buttons in top-menu (header) got lost.
Is there a file(s) which I could externalize from docker container in order to fix it?
Or is this a common behavior?

And if I try to change URL to access any app installed previously then I get redirected to /apps/dashboard. Seems all apps are not installed after docker docker restarting. But in application list all installed apps is β€œon”.

I found the solution.

I missed to externalized /var/www/html/custom_apps as volume.