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More than this pressing spacebar should have gotten some customisation by now, eg. certain mp4s/markdowns/any other file-extension for quick previews

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You can install your own QuickLook plugins to handle those, and more. I found all the ones I use on GitHub: QLVideo, qlmarkdown/QLCommonMark, qlstephen, etc

https://github.com/haokaiyang/Mac-QuickLook

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