What is the best way to download 4K videos to an iPad?

Hi, I have a M1 iPad Pro 12.9". I want to not only watching but also downloading the videos in 4K. What is the best way to do it? In the past there were websites which accepted urls and auto converted and saved the videos. However, recently those websites became doggy so I am looking for a safer

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What is the best way to download 4K videos to an iPad

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