With Dash you can view the following information about each asset:
How many times it has been downloaded
Which users have downloaded it
When each user downloaded it
What format of asset each user downloaded (e.g. the original, or a resize or preset)
Whether the asset was downloaded by a user or from an external share link
You can also filter all of the above information by a variety of date ranges.
How to view asset download information
Open up an asset, and look at the asset details section of the side panel:
You can immediately see the total number of times that asset has been downloaded.
To see more detailed information, click "View download activity".
From this screen, you can view all of the information about the asset's download history, and use the buttons at the top of the screen to filter by an appropriate date range.