My requirement is fairly complex, but to understand the issue better I have a simple test HTML file with
<a href="#xx">go to xx</a>
at the top of the body, and an anchor
<a id="xx">
at the end of several pages of text.
As expected, on DropBox clicking on "go to xx" takes the browser down to the bottom of the text.
On a normal server I would expect https://...#xx to open the page directly at the bottom of the text, but this does not seem to happen on DropBox.
This is important for me as my document is very long and I want to provide a quick way for users to open it at various points.