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1. In the CMS, navigate to Content → File Manager.
   
    
   
   
2. Click the Images folder, then ProductImages.
   
   
   
   
3. Click into each of the 50, 250 and 500 , 500 and Large (for 1000px) folders and upload the appropriately-sized placeholder imageimages.
   
   
   
   
4. When you have finished, refresh cache.  

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