[zanders]

Update: I found out a way. After installing artwork beef, in the settings I had to enable KyraDB and enter API keys of my account, after that artwork beef could recognize animated artworks also and download them.   

....And How you managed that.
I have Arwork Beef and enabled my KyraDB API user and key filled in.
Animated posters are downloaded to the folder where that specific movies resides, but it will never show the animated poster.
....Unless i select it manually through the context menu for every single movie !!!

Peter   

Hi. First of all I'm using Aura skin. It shows animated posters itself. You have to enable it in the settings.

**But sometimes it might have a bug and not showing all of them. It might show one movie and not showing another although you know it has an animated poster. After exit and restart Kodi it should be fixed.**

I always export my library to make sure everything downloaded offline to library folders. Another skin which supports animated posters is Ace2.
Trying these two, maybe solve your problem! 

Did you ever find a skin that works consistently with Animated Posters? AEON MQ8, Aura & ACE2 all seem to be hit and miss. Some Days they all work , other days they are intermittent.