The following table lists file synchronization activities in SharePoint Online and OneDrive for Business.
|Allowed computer to sync files
||User successfully establishes a sync relationship with a site. The sync relationship is successful because the user's computer is a member of a domain that's been added to the list of domains (called the safe recipients list) that can access document libraries in your organization.
|Blocked computer from syncing files
||User tries to establish a sync relationship with a site from a computer that isn't a member of your organization's domain or is a member of a domain that hasn't been added to the list of domains (called the safe recipients list) that can access document libraries in your organization. The sync relationship is not allowed, and the user's computer is blocked from syncing, downloading, or uploading files on a document library.
|Downloaded files to computer
||User establishes a sync relationship and successfully downloads files for the first time to their computer from a document library.
|Downloaded file changes to computer
||User successfully downloads any changes to files from a document library. This activity indicates that any changes that were made to files in the document library were downloaded to the user's computer. Only changes were downloaded because the document library was previously downloaded by the user (as indicated by the Downloaded files to computer activity).
|Uploaded files to document library
||User establishes a sync relationship and successfully uploads files for the first time from their computer to a document library.
|Uploaded file changes to document library
||User successfully uploads changes to files on a document library. This event indicates that any changes made to the local version of a file from a document library are successfully uploaded to the document library. Only changes are unloaded because those files were previously uploaded by the user (as indicated by the Uploaded files to document library activity).