As a non-EU national, can you apply for a long-term D-type German visa while you are in Germany with a Schengen visa?
Note: I am a Turkish national.
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No, as a general rule 3rd country citizens that require a residence permit for long term visits (longer than 3 months), must apply for a D-Visa at the 'competent mission' (mostly based on your main place of residence).
Exceptions exist for the citizens of the following countries:
who may apply after their arrival in Germany.