When you include an image in the 'Actinic Stylesheet' layout, or in another custom *.css file you are using, make sure you include single quotes in the code e.g...
background-image: url(background.gif);
...will not work. But...
background-image: url('background.gif');
... will ensure the image is picked up by SellerDeck and will be uploaded and previewed correctly.
background-image: url(background.gif);
...will not work. But...
background-image: url('background.gif');
... will ensure the image is picked up by SellerDeck and will be uploaded and previewed correctly.