Endpoint scanner currently does not Scan the Network Share drives.

Files over the network share are accessed by impersonating the user which has the read/write access to the file.

The Endpoint service runs under the LocalSystem account, and that this account (per se) does not have any network access.

The Endpoint as of now does not impersonate the user with access over the network share to scan it, thus it is unable to scan the network drives.