when i try to go to nauvis, it says that it is inaccessible from current position, also the other planets dont even show even after researching them

also when loading an existing save, it works

Please refer to the newly added introduction in the Tips and tools section. Nauvis is not reachable, but I have to keep it unlocked, to make starmap usable. And you need to launch the newly added starter pack instead of research technologies to discover planets.

And the platform on vulcanus surface has a foundry.

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Resources from the volcano planet are sent to the platform. And how to send from the platform to the volcano planet in automatic mode?
In manual mode they are dropped.