Law / Temp residence in Poland (came here on a Schengen visa to get my US visa extended) [5]

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Quick visa query - student visa extended without returning to country of origin

Wondering if there are any non-eu people here who can tell me if a student visa can be extended without returning to your country of origin?

American living in warsaw, trying to get a new lease on my visa by going to berlin, not all the way to the states, is it possible? Anyone?

Cheer for any help.