Save container plan on a disk. You can save by the same name (overwrite preservation) or the different name (a name is named and saved).
Notice) The data sent from CubeMagic engine is saved as a temporary file of the name same each time, and send to a CubeMagic.
Therefore, you can not overwrite preservation when a viewer is opend from a packing editor.
Please save data in your own folder by [Save as].