@eastgate, I believe @jrl is referring to exporting to HTML per this reply of mine, above, not to the RTFs per se, mentioned in the original posting in the thread.
An answer (among many) for @jrl is to put your images into a subfolder of the folder where you will export the document. I usually use a folder named images. Rather than adding the images to the $Text of your notes, you add a reference to the image such as this (for an image of a bird):
When you export the HTML it will have the correct image references. When you import the HTML you will see the images. Word 365 or Word 2016 or later might ask permission to open the image files, due to macOS gatekeeper protections. You can then save that document from Word as a .docx file that contains the images.
(Note Tinderbox Preview will not show the images when you use this particular method – there are other approaches, if Preview matters to you. You can also use more complex
<img> tags and CSS to position, size, add borders, etc.)