By tapping the "View Documents" button on the actions menu whilst on the authorisations detail page. You will be shown the documents page, this will have a list of all documents applied to this work order.

 

At the top of a list, is show / hide related documents button, by tapping this you will show / hide all documents that are related to this type of work order.

To view a certificate from the list simply tap on the name or the ">" arrow at the end of the row. This will show the open document screen.

If you wish to open the document, tap the "Open Document" button, if not tap the "Back" button in the top left hand corner of the screen, this will take you back to the list of documents.