Multiple Worlds Possible ? How to Download World and adjust for Offline Play? How Do I upload a OFFLINE World To Aternos?

Good Evening from Borås, Sweden

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Multiple Worlds Possible ?, Can I change to another World thru Console ?

How to Download World and adjust for Offline Play?

How Do I upload a OFFLINE World To Aternos?

Thank You for answers. I realise that maybe i was not so clear , i have two zip files that contains maps over two regions from Sweden , One World is Stockolm Kommun and One is Falkenbergs Kommun. Both world are uploaded without any problems , but it only Stockholm Kommun that is default, how do I go to the other World.

On a OFFLINE game this is made with just a WorldChange in the menu.