AI Content Rewriter replacing existing images

I have product posts that have images in them. When using the rewriter, and checking the boxe for " <b>Protect HTML Tags in Edited Text</b>", the rewriter ends up removing the tags. Is this normal and is there a way for me to prevent anything from changing in the original post, but instead add to the existing content? Would using the shortcode inside the original post be the only way to append or prepend the rewriter content? Or am I using the wrong tool for adding new content to existing posts? Aside: Does "<b>Disable Editing of Content Longer Than This Character Count</b>" include HTML tags? i.e. img tags or any other HTML content? Thanks!