Will this imagery load into FW Office? If so, then you need to copy the original imagery file along with the one FW creates with same name extension.ini to same folder on Nomad. Then from Mobile you can go to file-Layers. Click Open. Change the file type to correct image file type and browse to where you saved the files. Highlight the image file name (you will not see the one with the .ini extension) and select Open. Tap OK at the Background box.
If you are referring to the background imagery that loads, no this option does not export etc.