Why are some of the posts able to show the picture and some just have link? I used the [img] tags, but I still just get a link.
The forum software isn't that intelligent and will only load images if the link ends with jpg/jpeg or png. It cant figure out things like short URLs, Imgur directories and stuff with trailing characters like validation keys, unfortunately.
Got mine to work by opening up my discord attachment (the original image), then copying the image address, which --as mentioned above-- ends in .png and therefore displays properly. Prior to that, it ended with the width and height, and I had a link in my message.