Articulate Presenter Project still large after video taken out

Hello, I was experimenting with adding a large (50 mb) video to my Articulate presentation by way of using the flash movie option on a blank powerpoint slide.  At this point my Articulate PResenter project file was about 58 mb.  I then deleted the slide, and added a new slide, and then used the flash movie button again except with a smaller video (12 mb).  Now my articulate presenter project is about 68 mb - it seems almost as if the large video is still there, and now with the smaller video added as well.

Any explanation or reason for this?  What should I do to resolve this?  

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