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Hello! Based on my experience, I can say that there are a lot of nuances when working with PDF files. Personally, I quite often encounter problems after downloading a PDF format and recently I found a useful article https://viewthevibe.com/deleting-pages-from-pdf-online-how-to-do-that/ on how to quickly and easily delete required pages from the PDF file. I think you should also take note of this useful information and use it to work with PDF.