We have switched the default action that occurs when you are in a plan, hover over an item, and view its attachments. If you click on the file name itself it will now open the file in the new Media Player, and if you have permission to download the file, a secondary button to download it will appear.
Since many files are not downloadable, it makes more sense that the primary action when clicking on a file is the action that everyone can do. In addition, we recently changed the primary action on the new Song, Arrangement, and Media pages to allow in-browser preview of almost all files. This brings the plan page in line with that to have a consistent primary action across all of Services.
Click the file to preview, click the secondary download button (if you have permission) to download.