found the problem, module https://www.opensource-socialnetwork.org/component/view/6608/image-editor changes the profile .gif to ,jpg
Disable this and it works

Well, all I see is:
The first images posted in the newsfeed 18 hours ago are JPGs like
**https://onderwijssociaal.nl/post/photo/25/8e296a067a37563370ded05f5a3bf3ec.jpg**

while the lastest post 16 hours ago is in fact a GIF
**https://onderwijssociaal.nl/post/photo/27/02e74f10e0327ad868d138f2b4fdd6f0.jpg**

Okay. Thats the problem. Upload.gif as profile avatar it becomes .jpg
Added in newsfeed it stays .gif

The gamer gif is working fine for me.
The image shown on https://onderwijssociaal.nl/u/beheerder
is not a gif but a jpg

indeed, more detail would be helpful
Okay, got this module running already.
My vps:

NVME-4G

RAM; 4 GB
CPU Cores; 4
Storage; 80 GB NVMe
Bandwidth; 20 TB / month
IP; 1 IPv4 + /64 IPv6

But it is the user avatar that does not animate.
newsfeed post works

resize it to 50x50 still no user avatar movement

See https://www.opensource-socialnetwork.org/component/view/3456/animated-gif-support

It's of minimal help to tell us the performance of your VPS
you'd better focus on an exact issue description in a new topic like 'animation gets lost after uploading'
That would save a lot of forth and back posts. ;)

update, when choosing the image, the thumb preview works. After posting image stand still

thought so

https://gifdb.com/images/high/gamer-498-x-498-gif-y805czpzyg0r4v7b.gif
and from the website
https://onderwijssociaal.nl/u/beheerder

gifs are accepted by default. just verified with a 498x498 image.
you may share your pic that doesn't work...