I need a help, basically I upload photos in my post using Talkimg, but I don't know how to upload GIF
You can use gif in your posts and Despairo helped you but it's annoying and you need to avoid gif as most as possible.
Years ago, admin disabled right to upload animated avatars that are annoying and forum community complained too much about these animated avatars. I am sure that gif if overused will be annoying too.
Stop animated images in FireFox / Tor browser / ChromeOK, APNGs are now detected. Old ones are grandfathered for now, in part because people have ongoing campaigns, but in the future I might (or might not) go through and remove them.