In FB there is a morphed image sequence or video file (ultimately don´t know exactly what type of file it is) of an urban building situation (once to now) in Berlin that does not allow a right click ... Log into Facebook | Facebook How can you download such a file please?
it could be a few different types of media and a screenshot would help get you the exact steps but most times you have to first open the image \ vid before it can be saved
when you open the file, look at the full web address to see what file type it is i.e, www.facebook.example. Avi or . Gif