Hi, I just started to use jDownloads for managing free and paid downloads of PDF files. I'm very satisfied so far with the quality of the product, however there is one point where I have not found a way to do so far: for PDF files that are to be sold, I would like to offer a preview, i.e. a few pages of the full document so that users have a better idea of the PDF file before paying for it. I uploaded these preview PDF files through "Select Preview File" on the "Edit Download" page, but they do not show up anywhere. I would have expected to find a "Preview" link or button next to the "Download" button in the frontend, but that's not the case. Any suggestion?