Thank you for the sample document. It was not imported because it is missing the xml declaration in the file describing the relationships of the footer -"footer2.xml.rels". This file contains the relationship declaration for image3.jpeg which is positioned in the footer.
After adding the missing xml declaration, the file could be opened successfully. Please find attached a fixed version of your document. You could try to open it in our online demo.
Don't hesitate to contact us if you have other problems.
the Telerik team