EDIT: Fix the error and access the database in a free cloud-sandbox
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Following the documentation (https://docs.mendix.com/howto/data-models/migrating-your-mendix-database#1-introduction), I downloaded the backup from cloud portal and restore it locally in Postgres (locally doing everything okay as with the built-in database). The next step I need to do is that I can use Postgres on a free cloud-sandbox, but I don't understand how. The answers on the forum say otherwise (https://community.mendix.com/link/questions/102848) EDIT: Following the documentation (https://docs.mendix.com/howto/data-models/migrating-your-mendix-database#1-introduction) and answers (Mendix Forum - Questions), I downloaded the backup from cloud portal and restore it locally in Postgres, in order to test and find out where the error in the Sandbox is coming from (https://ibb.co/jzhc2Nr).The application works locally with Postgres without error, as well as with a built-in database. The next step I need to do is that I can use Postgres on a free cloud-sandbox, but I don't understand how. The answers on the forum say otherwise (https://community.mendix.com/link/questions/102848)