Apply Storyline 360 Slide Master formatting to content imported from PowerPoint

Becca -- I have a related, but separate issue.  I thought I'd try to leverage some of the merge-shapes options and the ability to customize my content placeholder titles in Powerpoint -- then save and try to import into Storyline.  What I'm seeing is that my merged shapes aren't showing up -- just a generic square content placeholder.  And my placeholders on the master revert to 'picture' and 'slide title'.   Is there a list of Powerpoint features that aren't supported by Storyline import? 

Being able to insert placeholder titles seems pretty critical to building a SL template. This should definitely be a feature request.  Telling people 'click to add text' doesn't help much when you're trying to guide them through a course template.  Thx.