Test case:
Native Only, Multisize (300x250, 320x50), GDN creative
Expected:
Creative: Native (Content Ad) [300x250 / 320x50]
Presentation: P301/P303
Native Only, Multisize (300x250, 320x50), GDN creative
Expected:
Creative: Native (Content Ad) [300x250 / 320x50]
Presentation: P301/P303