But, in OneNote for Windows 10, attachments in the page cannot be edited and saved back to the page. Attachments can only be viewed in a read-only mode.
In WordNote, you can open the attachment on the page to edit it, and then save it back to the page.
In WordNote, you can open the attachment by simply double-clicking the attachment.
After editing is complete, press save, you can save the edited file back to the page.