You can click on the Top Left Menu > Download Reports (if on the website, it's called "Reports") > Tax Save 80C Report.
Please note that the report that you download immediately after investments, may not have folio numbers. They will start reflecting once the dashboard is updated with the investment details, i.e. in up to 3 business days.
This report is accepted as valid proof by most of the companies. Some may need the folio numbers as well but some do accept without the folio numbers as well.
You can refer to this FAQ to know about the other reports that we have.