Hello there,
System image is stored in the root of the network drive. Therefore, when you try to restore, the image it should be available in the root. If you store multiple back up copies, you must rename all the other backups and save one backup with the original name.
The network path should be as follows \ComputerName\SharePath.
Check that you have valid IP configuration. If you don't, install necessarry driver and check again.
Connect to your network location which holds your backups.
net use \pc1\backups /user:localhost\operator
In the example above adjust for your network name and user name.
The below thread discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.
https://answers.microsoft.com/en-us/windows/forum/all/win-10-image-restore-from-network-location/2c6710e4-120a-416c-bc74-898bba23b71c
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