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It doesn't have any special logic for image boards; it sends whatever you click on. You'll need to click a thumbnail to get it to send one.

At some point I'll probably make it a bit smart for danboorus: figure out the thumb path when clicking on the image in a post, and pass the tags, etc. through so the image search can offer an upload form with defaults. It's a bit inconvenient to open several post pages, and then when I decide I might want to upload something, to have to backtrack to the index and find the correct thumb to click on.