How can I move a project that includes images-as-planes? I am working on a project that includes images-as-planes.  I would like to copy the whole project to another computer.  How can I move the Blender file and also relocate the image-as-planes source PNGs without the Blender animation file losing track of where to find the PNGs?

Thank you!
You can pack all external data into the blend file by clicking on "File → External Data → Pack into .blend file"