Mark up PDFs and write on them with a pencil. Your files stay on this device.
Nothing here yet. Open a PDF or start a notebook and it will show up in this list.
Take a photo of a page, or import photos you already have. Several pages go into one PDF.
Pick a paper. Pages are A4. You can add more pages at any time.
Tap a page to go to it. Changes here cannot be undone, and the marks on moved pages travel with them.
Connect your OneDrive to open PDFs from it and save your changes back into the same file. Margin only asks to read and write your files, and keeps the sign-in on this device.
No folders or PDFs here.