Hello.
Notes can import Markdown files and open them in Notes format, and it can export notes in Markdown format, but it is not a Markdown editor. So pasting or typing **bold** will not work in any note.
No indication from Apple if that will ever change.
If you want a free Markdown-based notes app that works across macOS, iOS, Windows, Android, and Linux,
Obsidian is worth a look. For me, it has replaced Notes, Word, Pages, Keynote, Scrivener, Bear, Ulysses, Typora, Day One, Journal, etc.
I use it as a
database for storing and reporting data (so many
plugins available). It doesn’t even break sweat sorting through six million words in the blink of an eye. Apologies if you already know about Markdown alternatives, which having posted in a beta forum, you almost certainly already do know about. My bad 🤦♂️
🤝