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There are two problems here.
First, when you are building the album, jAlbum and the skin have no idea where you're going to upload it. So, they have no way of determining what the final URL will be.
Second, a canonical URL attribute is normally used to choose the "best" URL for a given page. If there are multiple ways on your site to reach a certain page, resulting in different URL's, how would the skin know which one to use as the "canonical" URL? If it's just the URL of the current slide page, there is no ambiguity, and there is no reason to declare a canonical URL. The search engines will find only one URL - the current one.
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