This article contains information that applies when you use the OneDrive for Business Next Generation Sync Client (onedrive.exe) or the OneDrive for Business sync client (groove.exe) OneDrive for Business sync client.
Note To determine which OneDrive sync client you're using, see the following Microsoft website:
When you synchronize a Microsoft SharePoint Online or OneDrive for Business library to your computer by using the OneDrive for Business sync application, a file that was synchronized is unexpectedly moved from the SharePoint Online or OneDrive for Business library to the SharePoint Online or OneDrive for Business recycle bin.
This scenario frequently occurs because the file was accidentally deleted or was removed by a local application for a user who was synchronizing the library. You should check the Deleted By field for the affected file in the SharePoint Online or OneDrive for Business recycle bin. The account that's listed in this field is for the user who performed the delete operation for the file. When you delete a file locally in a folder that's configured to synchronize by using the OneDrive for Business sync application, the delete operation is synchronized with SharePoint Online, and the item is moved to the recycle bin.
You can confirm that the file wasn't intentionally or accidentally deleted by the user who is listed in the Deleted By field. This is important when multiple users are synchronizing a single library. For example, in some cases, a user may try to copy a file that may have been accidentally moved to another directory. This removes the file from the synchronized library.
If the file wasn't intentionally or accidentally deleted, you should have the user who's listed in the Deleted By field review his or her computer to determine whether a local process moved or deleted the item. For example, local virus-protection software may be configured to quarantine files.