[Harro]

Ok, i get the solution but only for manual. In library click on selected movie for context menu, select animated art, search for poster, go to folder which content the gif, select the gif and thats it. Works also for gifs on my Synology NAS. What not work is to get animated fanart.
But my question was how to change the old routine to the new so that the skin do automatic do this as before.

Only way I can see this as fully automatic is if you store all your art work on the computer running Kodi.