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seeing blank pages in large pdf on readers is often because the renderer cannot keep up with scrolling. you have to scroll S L O W L Y or wait for the device app to catch up. a slow PC can also show that symptom , on a complex PDF
file size changes ( small) may be down to how different devices choose to display them - quote the numbers you see. or maybe the transfer did not complete because tour wifi dropped, though that would usually lead to a corrupted file
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