BTW, if you are creating your own PDFs, there are ways to make them work well with smartphone screens. Most of the PDFs we get on the internet are formatted for 8.5" x 11" paper, or some similar large size compared to a smartphone screen. Since PDFs don't scale/flow text, that creates the issue of using them on small screens. But if you create your own, try making them 2.5" x 4" instead, and then play around with the font and font sizes to make them work well with a smartphone screen. Then you don't have to scroll the page around to read the text. Of course a 2 page letter size document will need probably 10 or more small sized pages to hold the same text, but at least they fit a comfortable reading size text on the screen and each page can be viewed full sized and then flicked to reveal the next page.
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