Problems with migrating DB from Heroku to local Strapi


I am very new to Strapi and Heroku, but I was given a website and now I want to test some things locally. I have installed Strapi and postgreSQL, I have also downloaded a database backup from Heroku and imported it into the postgreSQL database.

Now I am wondering when starting Strapi and checking the admin panel, why there are no collections or content. I have checked the database backup by exporting it from postgreSQL and the content is included. Any ideas why the admin panel in Strapi doesn’t show the content and collections?