The photography studio sends all the negatives. Why do film companies still choose films under the overlord clause? What terms did the studio violate?

The photo studio didn't violate the terms. The photographer enjoys the copyright for the redundant photos. If you want to get the negative, you must pay a certain fee. But for the studio, if you don't choose to take extra photos, you can't use them for other purposes, otherwise you will infringe on your portrait right ~ ~ ~