If you intend to change residency and your current permit is expiring, you may apply for a French D visa before its expiration. The primary rule for visa applications is to spend the majority of your stay in the country that issued the visa (in this case, France). While there are no internal border controls within the Schengen area, travel can be tracked through flight tickets, hotel bookings, and potential checks at borders or during transport. The issuing country may request proof of proper use of a previous visa upon subsequent applications. Currently, France does not meticulously verify internal travel routes as strictly as some other countries (like Hungary previously did). However, border checks can occur, and you should be prepared to demonstrate your travel intentions and accommodation bookings.
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