Document Preview vs. Download

Question: I have been asked to create a report that identifies if users have downloaded a monthly report.The report is created outside of Workfront then added to Workfront and an update is sent to let the user know the report is now available. I created a Journal Entry report that identifies when and if  these documents have been downloaded. Mission accomplished. But then, I was asked if this included if someone clicked “Preview”. Well I thought because it was an Excel doc. and automatically downloads when Preview is selected I would be good. But low and behold that is not the case. Preview doesn’t count as a download even if the document is downloaded. Anyone have thoughts on how I might be able to deliver this information?