Thank you for your post.
When you Insert a picture onto a layout, you are prompted for a file name, and at the bottom of this dialog box, there is an option "Store only a reference to the file". If this is checked, then the picture/image is not embedded into the database file, but merely referenced. Then, when you open that file on another machine, it will look for the file, and if not found, display the path.
Great. Thanks so much.