There are tons of custom environment attributes you can map to the attributes in Insights, but when building reports in tabs you can't sort/filter/display on system generated file attributes like file type (DGN, DOC, XLX), file creation date, and owner/author/created by. You also can't map fixed system attributes to Insight attributes. There are a handful of fixed attributes that are included, like file size (really?), so I would like to see the rest of them made available for reports.