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Description
If you edit a payment (civicrm/contact/view/contribution?action=update&....), and select "Send Receipt?", you will get an email, but no attached PDF - regardless of the "Attach PDF copy to receipts" setting in civicrm/admin/setting/misc.
Similarly, if you edit a participation (civicrm/contact/view/participant?action=update&...) and select "Send Confirmation and Receipt", you will not get an attached PDF either.