Once you have uploaded a new version of a video or image on top of the old one, you can switch between them at any time using version dropdown. You can find this in the top left of the header on the review page. Simply click on the version you wish to view.
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When you switch to a different version, all the comments and to-dos on it will be there too.
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From this dropdown, you can also user our handy Version Comparison feature.