Hi @Victor, I do too. My workaround with that has been what @mwra referenced above, to link to the images and then preview them in Tinderbox. All you need to do is use HTML tags or markdown and specify the page to the image. You can then preview the image in Tinderbox.
Here is an example:
Here is a TBX file with to smaller examples: TBX L - Working with Markdown and templates in Tinderbox.tbx (147.8 KB). This file shows the strategy for linking an image in markdown and in HTML. You can then use the preview to view the images.
HTML <img src="/Users/michaelbecker/pandocSP/mBecker.jpg" width=50px>
"
Markdown ![Becker](/Users/michaelbecker/pandocSP/mBecker.jpg){width=50px}
:
There are a couple of training videos on this too.