Apple does not provide a way to sort Photos by size (on purpose, so you pay for more iCloud storage), this script allows you to highlight videos that are > 30 seconds long, so you can easily reclaim some space.
Dear Apple, please let us sort our iCloud library by File Size / See what files are taking the most space.
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Install TamperMonkey, and then install icloudcleanup.js as a user script.
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Go to https://www.icloud.com/photos/ and then Media Types -> Videos
Thanks to Andy Kong for the original script on this HN thread