How can I upload a file attachment to a Dashboard?

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I can't find an option that lets me upload an attachment file to my dashboard, just like adding an attachment to a web page or email. It should be a simple action, but I can only find various "Widgets" that talk about linking to content somewhere else. I want to upload the file to the dashboard; we can't use any third-party file storage options because of licensing and privacy issues. Where's the Upload button?

Pre-emptive: This has nothing to do with reports or reporting. I'm looking at a Dashboard, a web page mocked up to present the instructions for a worksheet's underlying forms, and I need to include a list of approved model numbers for one of those forms. It's definitely not a report.

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