To add an image to an existing page, simply tap the image button in the toolbar while you're working in Notepad+.
If you’d like to open a PDF or image file (PNG, JPG) in Notepad+, use the “Open In” option:
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In the app where the file is stored, select the PDF or image you want to use.
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Tap the Share icon, then choose “Open In.”
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Scroll through the list and tap the Notepad+ icon.
Notepad+ will open and create a new notebook using your selected file as the template.