Hello,
I tested your code and the code given by amazon for footnotes popups (
https://kdp.amazon.com/help?topicId=A1IZ6N1F51ZYJ2) but it doesn't work on my wifi kindle (version 4.1.1). It sends me to a new footnote page so I have the same problem with the back link.
Does anyone have an example that works on this version of kindle or any solution to this problem ?
Thank you very much for your help.