Community Tip - Did you get an answer that solved your problem? Please mark it as an Accepted Solution so others with the same problem can find the answer easily. X
The first thing to do is to track the information about the downloaded event.
How to get "Download" event information in Security Audit Reporting
Then you can report about list of downloaded CAD documents
To get dimension of attachments you can use this report
Report that lists the size of CAD Documents and their location
Here another way to get size of documents