Trim a screen cast in Storylines 1


I recorded my desktop screen through Storylines and saved the file. I inserted the screencast as a video onto a slide. The video length is 44 seconds. 

I clicked on the video to Trim some of the front part off but can't figure out how to get the "trim" to stick. I select the Trim icon and 2 red lines appear on the timing portion of the video. I moved the red lines so only the portion of the video I wanted was within the red lines. Then I clicked on Trim again. The red lines disappeared but nothing was cut.

Thanks for your assistance,


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