Where do I see what a lender read and downloaded?

On the Dashboard's Analytics tab, in the Lenders section at the end: each lender's people, the documents they opened and read, and what they downloaded, grouped by lender. Download lender views (CSV) there gives you all of it as a spreadsheet, with the lender each person is from.

A document's page-by-page reading has a Lenders table too, and the daily summary lists lenders after your investors. To see everything one person did, open People and folders on the lender's card in the loan tracker and choose their name.

Lenders are never counted as investors: not on the Dashboard, in Analytics or in the investors' spreadsheet.