Yes, if you are adding an image with an LoS file to a campaign, you need to place in the campaign images folder; and the LoS XML file must have the exact same name as the image file, but with a .xml file extension instead of the image file extension (Ex: A.png; A.xml)
Then, once you've restarted the campaign, you need to create a new image record with that asset by opening the Assets window Campaign folder, then dragging the asset to the Images campaign list.
Regards,
JPG