Screen Captures for Engage are Fuzzy

How can I get crisp screen captures to upload in Engage without the image being fuzzy?  I tried the lock the Presentation Size in Optimal Size in Presenter, but I need to be able to upload crisp images in Engage not Presenter.  I used every image capture program possible and resized the images.  Not sure what I can do to make my images look clean. 

Thanks in advance for any advice!

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