I got it to work but the folder has to be different. It saves the indexed frames but it changes the order:

Test: I extract 12 frames and I name them Att1 up to Att12. The Photoshit saves them in this order (I applied a number on each screen to detect the new order):

1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9.