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PDFs are one of the most used file formats for many reasons. These days, opening a PDF is pretty easy, no matter which device you're using. However, editing a PDF isn't that simple unless you have a PDF editor
I have checked your list and tried many of the apps, I would like you to add “Paper Scanner Pro”app in the list. This is the best product I have found that works well. Doing things like combining and reorganizing pages is easy