I wonder this is marked as answered without any reply or having correct answer.
GetContainerAttribute ( container ; "filename" ) give you the name.
Old FMs don't have this function.
in the past versions, didn't we just use the container in a text field (calculated or auto-enter)?
field: myImage (Container)
field: myImageName (Text, auto-enter calculation = myImage)
I received e-mail artical "Display Filename of Container" from FileMaker support
GetContainerAttribute ( container ; "filename" ) is what I'm looking for.