Posting pics/gifts in threads

[Smellybuttface]

So I might be completely computer inept, but I can't seem to post pics/gifs etc. into my thread replies in any sort of seamless fashion. I can do the "attach files" option at the bottom, but it never comes out looking as streamlined as it does when I see others attach the same.

Is that the only way to attach these types of files, or am I missing something and there's an easier route to it?