Office 365 (PC • Mac) How to Save Documents
Important Office 365 Links
You can use the Save and Save As commands to store your work, and you can adjust the settings that Microsoft Office uses to save your documents.
The links below are from Microsoft Office Support and are geared toward Microsoft Word but can be used for all Microsoft Office programs.
Save a document for the first time
Save an existing document as a new document (Save As)
Save a document on a CD
Save a document on a USB memory device
Save a document in a location that can be accessed remotely
Save a document so that it can be opened in an earlier version of Word
Save a document in alternative file formats
NOTE: If you commonly save documents in a particular place or format, you can adjust settings so that Word defaults to these choices.
Save Documents in Microsoft Office 2016 for Mac
Credit: Save a document in word