Option 1: Directly out of PSS catalog
Step 1 - Click on Catalog view and locate the product. Click on the product name and you will be taken to the Override Management Center.
Step 2 - Click on the Upload File or Upload URL button and submit the command.
Option 2: Import .csv File via PSS File Center
Step 1 - From Dashboard, click on File Center > Schedule a Job > Import Image Overrides
Step 2 - Use the template that is provided and make sure you follow each note. Once you have the SKUs formatted correctly to the PSS format and a valid image URL just import the image override file.