That is a great question!
Many students are used to signing into their online Office products and working from there. This is not wrong but some of the tools that are available in Word, PowerPoint, and Excel are not available in the online versions.
If you are home or at school here is a good "first step" whenever you are trying to save or access your files in OneDrive without going online first:
Use OneDrive with Office
You can quickly open and save OneDrive documents right from your Office apps like Word, Excel, and PowerPoint. If you also have the OneDrive desktop app installed on your PC (some editions of Office come with the OneDrive desktop app), OneDrive and Office work together to sync documents and let you work with other people on shared documents at the same time.
To save Office documents to OneDrive:
Sign in to OneDrive when you install Office, or right from any Office app. Tap or click Sign in in the upper-right corner of the app, and then enter your Microsoft account email address and password.
Open the document you want to save to OneDrive, tap or click File > Save As, choose your Maranatha OneDrive, and then choose the folder where you want to save the file.
An important thing to notice is that you can, as long as you have signed into your Office App (or Program) first, then you will see all your OneDrive Files to OPEN from the same place when you select "Open."
- Just browse again to the same place inside your program (Word, PowerPoint, Excel), find your Maranatha OneDrive, and find your file to pick up where you left off! Most of the time, your OneDrive files will show up in your recent files too, so you will not even need to go hunting for them!
This information was gathered in part from an article at Microsoft, head there for even more information.