The images are called using standard html with only an image class and source and all images are attached to the post. The image sizes have been generated, but I don't know how to call them. I can adjust the html if need be using better search and replace, just don't know the correct way to get the core responsive feature to work on these images. Thanks.
<img class="someclass" src="https://example.org/images/my-image.png">