Can't import PowerPoint slides into Storyline 360.

I am running into the same issue.  I updated windows, articulate, ran an office 365 online repair.  Tried previous versions of PowerPoint, 64 bit, 32 bit.  I updated the latest software packs for PowerPoint and Office 365. The PowerPoint is not password protected, not encrypted, it does not require admin to run, but I am local admin on my device.  There are no security permissions set. All PowerPoints start with slide 1.  I felt as if I tried everything.  The only way I could get this to work was to create a copy of the original PowerPoint, then break it down into 32 separate PowerPoints.  One for each slide.  Then upload one at a time to Storyline360.  Once done, I combined them all and was able to save it as a .story file.  This went from a 20 min job to 6 hours of work real fast....  Is there an import size restriction by chance? A few months ago, I was able to import a 122 slide PowerPoint with audio and videos embedded.  I am so curious as to why this PowerPoint produced import issues, when it is much less cumbersome?