Approvals in a SharePoint document library

A really important step to start with is to check the Microsoft 365 Audit log in the compliance portal. Search for activities like “FileModified” or “FileUpdated” right after you approve a file. That can show exactly what account or process is changing the item. If it’s a flow, you’ll often see the user or service account that owns the flow. Also check the run history of any Power Automate flows connected to the library to see if one triggered at that time.