Epson DS-790WN Administrator's Manual page 48

Required Settings for Scanning
8. Click OK.
9. Select Security tab, and then select Authenticated Users on the Group or user names.
"Authenticated Users" is the special group that includes all users who can log in to the domain or computer.
This group is displayed only when the folder is created just below the root folder.
If it is not displayed, you can add it by clicking Edit. For more details, see Related Information.
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Setting a Shared Network Folder
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Creating the Shared Folder