Edit #2 :
~~testing to be done~~ : adding this :
https://lemmy.world/pictrs/image/... *.mp4?format=webp&thumbnail=256
... at the end of URL
Test result : it does show as a thumbnail but it is no longer animated.
Edit :
Only way I can make it appear on the feed as a thumbnail is is if I use an external site containing the *.gif image : putting the URL of that image in the URL field of the post.
~~to view : open this post since it doesn't show in the feed ...~~
// 3D Animated GIF
... of 4D geometry
by Jason Hise
Usage CC0 1.0 UniversalCreative Commons Licensezero
Topics Animated GIF
3D Animated GIF of 4D geometry
Addeddate 2012-01-08 20:54:57
Identifier 3dGifAnimationsOf4dGeometry
GiF immage converter to MP4 by Lemmy !
![GiF immage converter to MP4 by Lemmy](https://lemmy.world/pictrs/image/0a4ff6ce-9a4a-474d-9ccd-425ee459e2f6.mp4)
![GiF immage converter to MP4 by Lemmy](https://lemmy.world/pictrs/image/0a4ff6ce-9a4a-474d-9ccd-425ee459e2f6.mp4)
~~/image/0a4ff6ce-9a4a-474d-9ccd-425ee459e2f6.mp4~~
~~!(/image/0a4ff6ce-9a4a-474d-9ccd-425ee459e2f6.mp4)~~
tumbnail
source
Edit : I test again with another *.gif file
![](https://lemmy.world/pictrs/image/fff26561-4367-428c-93e1-36cbaad50aac.mp4)
https://lemmy.world/pictrs/image/fff26561-4367-428c-93e1-36cbaad50aac.mp4?format=webp&thumbnail=256
source :
https://i.imgur.com/YMY9RBh.gif