Forum:Uploading an image

Ok, I'm having an issue when it comes to uploading images. Whenever I attempt to upload one of my JPEG pictures, Wikia won't accept them. Instead it gives me a message saying: Upload warning The file is corrupt or has an incorrect extension. Please check the file and upload again.

I don't get what the problem is? I know it not my computer because I tried uploading an image on my laptop and it still didn't work. Can someone please tell me what I'm doing wrong?