Import your notes and files to the Notes app - Apple Support

Take the text files that you created in other apps, and import them into the Notes app. Then you'll have all of your notes in one convenient place.

Use Notes on your iPhone, iPad, and iPod touch - Apple Support

The Ultimate Guide to Bulk Importing Markdown Files Into Apple

How to import Apple Notes to Pages on iPhone, iPad, Mac

Export Notes as PDF on iPad OS 14 - Apple Community

Use Notes on your iPhone, iPad, and iPod touch - Apple Support

Create and format notes on iPhone - Apple Support

Use Notes on your iPhone, iPad, and iPod touch - Apple Support

TECH TIP: Import Your Notes and Files into the Mac Notes App

How to move notes from one Mac to another - Quora