Ok thanks a lot, it works! I have to create manually all videos thumbnails.
Is there a chance that it become automatic in the gallery next versions, or not?
For the dolphin, it wasn't a wild one but a US Navy retired one. Usually I prefer not to approach the wild ones until they decide it by themselves.
I was working in Moorea in French Polynesia for a fundation who save marine turtles and there was also a dolphin "sanctuary" for those that can't go back to wildlife. I worked with them to.
And about the experience : it was much more better than cool!
Thank you