Importing PowerPoint with Trimmed Videos - Importing Untrimmed

I may not be completely accurate on this (perhaps a support person can chime in) but I suspect that when you trim a video in PPT it just holds those places but doesn't actually create an edited video. It just knows what to show based on the trim point data. That's why you can go back in and change the trim points and you don't lose the video.

If you where to extract the .pptx file (you can do this with 7Zip) you'll see a media folder in there with the video that PowerPoint saves. You'll notice that it's the full length video and not snippets of trimmed video. When you import PowerPoint into Storyline, it'll will receive the video, but it's the full video and not the trimmed ones since they really weren't saved as trimmed videos.

One thing you can do to save the trimmed videos out of PowerPoint. 

• Hide the slides and show only one at a time.
• Save that slide as .mp4
• It will save the entire slide as a video. 
• This assumes the video covers the entire slide. You can go into the selection pane and hide everything else and maximize the video so all you get is video and not slide content.

It is a bit tedious, but with 14 videos it would only take a few minutes and then you'd get the trimmed videos which is quicker than bringing the videos into Storyline and trimming them in there.

On a side note, when I work with any external media like audio, graphics, and video, I try to do as much as possible outside the authoring tools so I have more control. And then when I build the course, I can focus mostly on assembling the content.