File > Import Images
Navigate to your folder of images that you want to load.
It is normal not to see images in the preview window. Load the folder that contains your preview images.
For best performance, use “preview optimized” .jpg images resized to 4000px on the long edge. Use quality 80%.
IPS Viewer Light supports up to 2000 images, based on machine performance.
If you are importing more than 800 images into a session, enable “Use Extra Memory For Faster Large Sessions” under Settings (bottom).