Can't import PowerPoint slides into Storyline 360.

I'm having a similar problem. I have a simple powerpoint illustration which uses combine shapes. I have office 365, articulate 360, latest update. All the best bells and whistles.

When I import this jigsaw image into 360, the circle shapes don't appear, just the squares.

If 360 doesn't like powerpoint, is there another application or file type that it prefers for illustrations? I need to make images somehow and 360 itself isn't intended to be an illustrator