Office 365 - Sharing a File within a Program

Office 365 offers the ability to share files with others. To use this feature while working on a document, select the Share button in the upper right corner of the document.
 
ShareButton
 
In the Share dialogue box, select who to share the document with as well as if the person can edit the document, or just review it.
 
A link to the document can also be retrieved for viewing, editing, as well as an option to create a QR code for viewing the document on a mobile device.
 
You can review others that the document is shared with and stop sharing as needed.
 
ShareDocument