You can upload a common default image for the cover page of reports. You do not have to upload a cover page for each report. The cover pages of predefined reports are modified when you use this option. The cover pages of user-defined reports do not change.
Where Do You Upload a Default Cover Page Image for Reports
To upload a default cover page for reports, in the menu, click Environment, and then in the left pane navigate to an object and click the Reports tab. From the Report Templates tab, click the horizontal ellipsis next to the Add option and click the Change default cover image option.
How Do You Upload a Default Cover Page Image for Reports
Browse for the image that you want to add to the cover page and click Save. You can also use the default product image that is available.