A Microsoft file hosting and synchronization service.
Hi there! Just to add up on the answer provided by the AI, you can temporarily stop OneDrive syncing, just look for the small cloud icon in the notification area near the clock on the bottom-right of the taskbar. You may need to click the up arrow first to see it. Click the OneDrive cloud icon, select the gear icon, then choose Pause syncing. You can pause it temporarily and then try saving the Word document again.
You can also check whether the file is being saved directly to OneDrive. In Word, go to File > Save As and look at the location. If it shows OneDrive, try saving a copy temporarily to a local folder such as Documents or your Desktop to see whether it saves normally.
I hope the above helps!