When reviewing the Click Through tab of an Acknowledgment Email report for a donation form, you see ereceipt links. The ereceipt links do not include views or unique viewers, even though you know they were clicked.
The Ereceipt link is not intended to be included in Acknowledgment Email Report. This link does not actually track a view. This is because the Ereceipt link does not resolve on a page, but instead calls out to the database to download a file.