User Activity Report: Content Accessed vs Downloaded/Previewed

I'm trying to report on what marketing content is most popular with our Sales team by creating a User Activity Report and have a question about "Content Accessed" events. 

Box defines "Content Access" as "Item has been accessed by an authorized end user or programmatically by a Box application" (source).

This sounds like it could include all kinds of activities on the desktop (such as a user opening, syncing, previewing the file, or even attaching it to an email). Is that accurate?

I'd like to get a sense of which files are most valuable, so it would be helpful to know what actions Content Access includes or doesn't include. I already am including other useful actions in my report (Downloaded, Previewed), so this question is only about Content Access.