When you upload a single image, you can choose what you want the image to link to. Your choices are: any URL you type in, nothing, file url, or post url. Post URL makes it sound like you’ll be linking to the page you’re on when viewing the blog post, because average users don’t get the who image-as-post-type thing. We should relabel that button in the uploader to be easier to understand for the average user.
“Image URL” sounds like it would do the same thing as “File URL,” so that’s out. “Image Page” is better, but is there something even more appropriate that one of you can think of? Leave suggestions for this button label in the comments below.