Scan a Document

With iOS 11 and later, you can scan documents in Notes, and add a signature or manually sign a document. You can also add a signature or sign a document with an Apple Pencil and compatible iPad.

To scan a document:

  1. Open a note or create a new note.
  2. Tap , then tap Scan Documents.
  3. Place your document in view of the camera on your device.
  4. If your device is in Auto mode, your document will be automatically scanned. If you need to manually capture a scan, tap  or one of the Volume buttons.
  5. Drag the corners to adjust the scan to fit the page, then tap Keep Scan.
  6. You can add additional scans to the document or tap Save when you're done.

To sign a document:

  1. Tap the document in the note.
  2. Tap Share icon, then tap Markup.
  3. To add your signature, tap , then tap . To manually sign your document, select a tool to use, then sign with your finger or an Apple Pencil with a compatible iPad.

Click here for source of information:  https://support.apple.com/en-us/HT205773