I can't upload pictues on my Thread

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    Hello. I want to know why I can't upload any image on my Thread in the Serverlist category. I tried to do that with Imgur, but it said that I should use the file attachment feature, which doesn't appear. I tried to drag the picture in and it should've worked, but the image wouldn't show up anywhere. (I can see the Attachments button when I'm trying to create a Thread anywhere but the Serverlist category)