Can't find the attachment box

[Petie]

Yup. Not sure why it was disabled but it's there now and appears to be working.

http://www.vg-resource.com/thread-5.html

5. Images & attachments

The use of attachments is discouraged. In order to show your sprites, upload the image file to an image hoster (like Imgur, Minus, Dropbox or one of the countless others). You can embed your image by using IMG tags (example below). For really large images (like ones that stretch the page), it's advisable to put them in SPOILER tags.

This also implies that the image is already uploaded somewhere else... what if we don't have accounts there?

Discouraging the use of attachments to display uploaded sheets wouldn't lead to outright disabling the attachment feature, at least not logically. Additionally, I'm pretty sure you can insert uploaded files directly into your post so attaching sprites and such to posts directly doesn't even seem like a horrible idea. I'll have to look into that as well.