[brazen1]

Hi bobrap.
I just spent the day working this out for my system since everything is automated.
Adding these .gif's is not automated since it's new to me. Perhaps in the future?

Most likely you didn't:

Press I (info)
Select extras
Artwork downloader/choose art
Select poster for example (if you downloaded a poster.gif and saved it to it's movie folder and it's named 'poster.gif')
'Browse' to 'Item folder' by pressing up arrow once
Select poster.gif.
Done.

I'm sorry. Just realized forgot something. My bad. Too much on my mind getting this going......
Add this to your advancedsettings.xml
<videoextensions>
<add>.gif</add>
</videoextensions>