OneNote for Mac can keep all of your information about any subject or project together in one place — including copies of related files and documents that you can attach to your notes.
Do the following:
On any page, click where you want to attach a file or document.
On the Insert tab, click File Attachment.
In the Choose files to insert dialog box that opens, select one or more files, and then click Insert.
Inserted files show up as icons on your page. Double-click any icon to open its file.
Important: Inserted file attachments are just copies of the original files. OneNote doesn’t automatically update the copies if the original files change at their source.