Hi,
To know the issue more clearly, would you please tell what's the error message when users tried to save files?
Also, it will be helpful if you can confirm the following questions:
When mapped the shared drives, did you use the file server name or use the DFS root name, if possible, would you please share a screenshot here?
You have created the DFS Namespace, and there are 2 folder targets on the 2 DCs, right?
How did you grant the permission for users on the shared folder?
Did you confirm that the new DC and replication works well?
Dcdiag /v >c:\dcdiag1.log
Repadmin /showrepl >C:\repl.txt
Repadmin /showreps *
Best Regards,