MAC: How to Open and Edit Attachments in OneNote?

Question:
With Mac OS version of OneNote, the Word and Excel attachments inserted in notes are read-only, but they can be modified on both the phone end and the pad, why?
 

Answer:                                  
OneNote for MAC runs in a separate sandbox. Unable to communicate directly with external programs.

OneNote's traditional attachments can be opened with local App, but they are impossible edit and save back to OneNote.

Solution:
In order to be able to use editable attachments.

You can save attachments as new OneNote cloud attachments.

Then use Gem Menu for Mac OneNote add-in to open the cloud attachment for editing.

This solves the annoying problem that the OneNote for MAC attachments have not been editable all along.
 
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