Everything in your Library will be in the OAM file. If there are assets there that you aren't using, you should delete them and your OAM file, and then publish again. Otherwise, look to see if you can lighten the weight of your assets, assuming that you have images that could be further compressed, etc.
HHow do I delete image assets, etc?!
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You just go to the images folder on in your computer outside of Edge and delete them. When you log back in Edge these images
won't be there anymore.
Thank you Joe, Smenegassi!