Directly from your iPhone or iPad camera: Click at the beginning of a line, choose File > Insert from iPhone or iPad, then choose Take Photo or Scan Documents to take a picture or scan a document with your iPhone or iPad and insert it in your note. (Requires macOS 10.14 or later and iOS 12 or later or iPadOS 13 or later.) See on your Mac, choose View > Show Attachments Browser.
Tip: You can add an attachments browser button to the toolbar for quick access. See Copy text, pictures, and movies in documents on Mac