virtual drive does not show up unter shared folders

[BarneyBoy]

I've successfully created a virtual drive for an ISO image file.

Inside the File Explorer the virtual drive appears unter the section "virtual devices", I can see all files and directories.

The app "Access Control" says: "This iso file will be mounted as a shared folder. You will be able to configure its access rights in the shared folders section." The mount command gives the following information:

# mount | grep share
/dev/loop0 on /share type ext4 (rw,relatime)
/dev/md1 on /share/home type ext4 (rw,relatime,stripe=32,data=ordered,jqfmt=vfsv1,usrjquota=aquota.user,grpjquota=aquota.group)
/dev/md1 on /share/Public type ext4 (rw,relatime,stripe=32,data=ordered,jqfmt=vfsv1,usrjquota=aquota.user,grpjquota=aquota.group)
/dev/md1 on /share/Web type ext4 (rw,relatime,stripe=32,data=ordered,jqfmt=vfsv1,usrjquota=aquota.user,grpjquota=aquota.group)
/dev/loop1 on /share/asustor type iso9660 (ro,relatime)

# losetup -a
/dev/loop0: [2304]:13 (/volume0/.@system/sharebase.loop)
/dev/loop1: [2305]:31719435 (/volume1/Public/iso-images/asustor.iso)

The directories home, Public and Web are listed under "Shared Folders", but not asustor. Therefore I'm not able to choose access rights, specially no NFS access rights. Hence, I'm not able to access the virtual drive from a Linux PC via NFS.

There is no problem accessing any other shared folder via NFS.

Hardware: AS1002T, Software: ADM 3.1.0.RFQ3

What did I miss?

Barney