Thanks Steven, I've had Dropbox since 2011. Ive got the Gallery folder in the public folder but the only link I can get is this one.
https://www.dropbox.com/s/qc4b79u6r3lotz5/index.html
My Dropbox does not look like the one in the pictures. I have no Copy Public Link option anywhere. All the copy link options I have only get me the above link.
According to dropbox there no longer are Public Links and now only Shared Links.
Here's my full code with URL
<iframe src="https://www.dropbox.com/s/qc4b79u6r3lotz5/index.html" width="800" height="600" frameborder="0" scrolling="no"></iframe>
Here's a link to the page. www.weatherbrand.com/gallerytest
What's interesting now is that I re-inserted the URL and instead of showing a big white empty box, it now says you must choose a collection to display.
For embedding I am using a Squarespace "code block" set to HTML.
Thanks!