In Magento 2, image URL format for Product Images and Product Descriptions are different. For images within your product's description, the image URL format should be "https://www.domain.com" + "/pub/media" + "/imagefilepath" + "/imagefilename.jpg". For example: https://www.domain.com/pub/media/imagefilepath/imagefilename.jpg.
If this is not the case, please update it accordingly in your Integration Configuration Settings.