When you create new eSlides by referencing images in a folder on the eSlide Manager server, you run the risk that some of those images may already be assigned to eSlides.
This page lets you know which images are already in use.
To use assigned images anyway (that is, to unassign them from other eSlides and assign them to your new eSlides), select the check boxes for the images you want to use and click Reassign Checked Boxes and then click Continue.