Is this preview generated on the fly every time someone clicks on the attachment, or is the preview also stored in the database and only regenerated when there has been a change?
Using Confluence 5.7.
As far as I know, the preview is performed when you open the page, and every time you open that page. I'm not 100% sure since I couldn't find the article stating specifically that, so I'll leave this question open as such someone might have detailed information on this procedure.
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