Do one or more of the following to enable it: If you are using Excel, and tried the above, you may have a file that contains features that are not supported by AutoSave. Your file is embedded inside another Office file. For more information on updating OneDrive, see Sync files with OneDrive in Windows. Your file is being synced by an older version of the OneDrive sync app. Your file is in a local OneDrive folder and OneDrive synchronization is paused.
Here are some common reasons for it to be disabled: There are other reasons AutoSave could be disabled as well. This will happen if your file is on a SharePoint on premises site, a file server, some other cloud storage service, or saved to a local path like C:\. If the file is saved to another location (or if it hasn't been saved at all, yet), then AutoSave is disabled. AutoSave is enabled when working on a file that is saved to OneDrive, OneDrive for Business, or SharePoint Online.