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If it is WebDAV, DAVx5 has a feature that makes those shares available as a local volume. An sFTP app can be used to xfer files.
TrueNAS probably has a service for synchronized folders like google drive. I don’t know how to access NFS or SMB transparently.
I don’t know, but there might be pdf viewers that permit editing layers. Try LibreOffice Draw or gscan2pdf. Maybe The Gimp can do it.