So in a case, we need to store the PDF file, although the user only added 1 small update to the file like adding ink or an image annotation, we have to rewrite 100% the PDF file to store it on disk? Is there any better way to handle this because every time I tried to close the file, it took really long time to save a 100MB file and the app block the main thread(probably because UIDocument is a library from UIKit)?
dhuy
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