Any images posted under Pages are stored in the Shopify Files section, which cannot be accessed and edited by Bulk Image Edit. Shopify does not give apps access to this folder, making it impossible for us to help you edit them. If you need to, you can move them to your theme's Asset folder, process them, and move them back.
Full list of image types that can be edited:
• Product Images
• Theme Asset Images
• Collection Cover Images
• Blog Article Images