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Tap Documents at the bottom of the screen.
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Tap the Project tab.
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Tap the root folder to see the list of folders.
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Tap a folder and then tap a document name to open it.
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To add a markup in the document, tap Add Markup .
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Add the necessary markups.
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At the top right corner, tap Options > Save.
Double tap anywhere on a document to zoom into it. Pinch your fingers back together to zoom out.