We do a lot of client reviews of videos and PPTs. It would be great to be able to upload these types of files for issue tracking.
We have given this a lot of consideration. We may eventually support PPTs but I am not sure it will be a perfect solution for storyboards. Many teams that use PPTs for storyboards place a lot of content off the slide (extra images, notes to SME, developer notes, etc.); these would not be displayed when the PPT is converted :-/
If you're developing eLearning, you could import your PPT and videos into your development software (Storyline, i.e.) and publish a SCORM course for upload on RML.