Nest Folders Inside Folders in Apple Notes From Mac App
Nesting folders is one of the easiest and most common ways to organize your files. For some strange reason, you cannot nest folders in Apple Notes app on iOS. MacSparky notes that this is possible from a Mac app.
In the Mac app, this works exactly as you’d expect. Open Apple Notes, then drag an existing folder on top of another to nest it inside. When you open Apple Notes on iOS, the subfolder will be where it should be, even if you can’t organize it that way on iOS.
Subfolder in Apple Notes | MacSparky