Downloading attached files is unnecessarily hidden. You currently need to hover the mouse over the file at which point a checkbox appears. Then, only when the checkbox is selected does the download button appear. Make this clearer. Turn on the checkbox and download button always. If download is selected without any boxes checked, then notify that a box must be checked to identify the files to download.
Second, I've attached a Wrike introduction video to a task and without Wrike for Marketers, my team is having trouble understanding how to get them to play. The initial reaction is to click on the video, however this brings up a gray screen that doesn't clearly state that the file must be downloaded to play. I'm getting a lot of emails stating that the video doesn't work.