Pasting a referral letter shouldn't flatten it.
What comes through
Copy from a web page or a document and paste into a note, and the structure is turned into the note's own formatting: headings, bold and italic, links, bulleted and numbered lists (including nested ones), checklists and quotes. Headings deeper than three levels land on the third, since notes have three.
Tables arrive as an aligned block of text rather than one run-on line, because notes have no table format. Text copied from a spreadsheet, a terminal or a CSV opened in a text editor gets the same treatment when every line has the same tab-separated columns. Only web, secure web and email links are kept as links; any other link keeps its words without the address.
A URL over selected text
Select some words, paste a copied address that starts with http://, https:// or mailto:, and the words become a link to it instead of being replaced. With nothing selected, the address pastes as normal.
Paste exactly as copied
Press Cmd+Shift+V (Ctrl+Shift+V on Windows) to skip all of it and insert exactly what you copied. Ordinary text with no structure pastes the usual way, and a read-only field ignores the conversion. It works in the plain editor and the formatted note editor alike, so a pasted heading turns up the same in both. Once it lands, it is ordinary note text you can edit with the slash menu and the toolbar.