To record the pictures there is two solutions:
1) You need to come back in vignettes mode with a click on "close" at the bottom of the picture or on the title  (Example G2_D1_La_nivelle); then select the desired vignette corresponding to the picture to be recorded,  click right and select "record the target of the link under'" (4th selection in the rolling menu) and record the  file.jpg where you want.

2) A right click made quickly when the picture appears, before the next and previous indication are shown and it is possible to get the option "record the picture under'" . You just have to train .